Gail Tverberg writes at The Energy Collective:
Myth 8. Renewable energy is available in essentially unlimited supply.
The issue with all types of energy supply, from fossil fuels, to nuclear (based on uranium), to geothermal, to hydroelectric, to wind and solar, is diminishing returns. At some point, the cost of producing energy becomes less efficient, and because of this, the cost of production begins to rise. It is the fact wages do not rise to compensate for these higher costs and that cheaper substitutes do not become available that causes financial problems for the economic system.
In the case of oil, rising cost of extraction comes because the cheap-to-extract oil is extracted first, leaving only the expensive-to-extract oil. This is the problem we recently have been experiencing. Similar problems arise with natural gas and coal, but the sharp upturn in costs may come later because they are available in somewhat greater supply relative to demand.
Uranium and other metals experience the same problem with diminishing returns, as the cheapest to extract portions of these minerals is extracted first, and we must eventually move on to lower-grade ores.
Part of the problem with so-called renewables is that they are made of minerals, and these minerals are subject to the same depletion issues as other minerals. This may not be a problem if the minerals are very abundant, such as iron or aluminum. But if minerals are lesser supply, such as rare earth minerals and lithium, depletion may lead to rising costs of extraction, and ultimately higher costs of devices using the minerals.
Another issue is choice of sites. When hydroelectric plants are installed, the best locations tend to be chosen first. Gradually, less desirable locations are added. The same holds for wind turbines. Offshore wind turbines tend to be more expensive than onshore turbines. If abundant onshore locations, close to population centers, had been available for recent European construction, it seems likely that these would have been used instead of offshore turbines.
When it comes to wood, overuse and deforestation has been a constant problem throughout the ages. As population rises, and other energy resources become less available, the situation is likely to become even worse.
Finally, renewables, even if they use less oil, still tend to be dependent on oil. Oil is important for operating mining equipment and for transporting devices from the location where they are made to the location where they are to be put in service. Helicopters (requiring oil) are used in maintenance of wind turbines, especially off shore, and in maintenance of electric transmission lines. Even if repairs can be made with trucks, operation of these trucks still generally requires oil. Maintenance of roads also requires oil. Even transporting wood to market requires oil.
If there is a true shortage of oil, there will be a huge drop-off in the production of renewables, and maintenance of existing renewables will become more difficult. Solar panels that are used apart from the electric grid may be long-lasting, but batteries, inverters, long distance electric transmission lines, and many other things we now take for granted are likely to disappear.
Thus, renewables are not available in unlimited supply. If oil supply is severely constrained, we may even discover that many existing renewables are not even very long lasting.
wind power, wind energy, environment, environmentalism
May 2, 2014
April 27, 2014
The Koch Attack on Solar Energy
The Editorial Board of the New York Times today published a rather misleading piece about moves to tax solar panels, which already commonly enjoy an exemption from property taxation. Property taxes are egregiously regressive and tend to punish homeowners for positive changes to their property, but favoring only the improvements made by one industry suggests cynical manipulation, not an interest in general reform. And indeed, that is not what the editorial is interested in.
As for net-metering, it is far from the equal exchange implied in the editorial. While homeowners get to install solar panels on the cheap by using the grid as a battery, net-metering laws generally require utilities to pay a hefty premium for taking the overflow. So not only are solar panel owners relying on a grid they no longer pay for, utilities have to pay them handsomely for dumping their excess production. Hence the logic of a tax on solar panels: to help pay for the grid that they continue to use.
Demonizing the Koch brothers, “big polluters”, and “big carbon” in these discussions is no more acceptable than the demonizing of all things Obama that the editorial decries about “Koch Carbon” ads. Nor is automatically defending all things Obama. In fact, Ken Lay of Enron, with the help of George W. Bush, essentially created the modern wind industry as a heavily subsidized darling of environmentalists. (Bush was keynote speaker at the 2010 American Wind Energy Association conference.)
Nor is coal threatened by solar and wind. It is the increase of natural gas that has reduced coal’s share of electricity generation. Because it takes several hours for a large coal plant to start up, it can not shut down as solar and especially wind production rises, because that production will fall again, usually unpredictably. That means coal must still be burned even while not producing electricity. Furthermore, world demand for (cheap) electricity is only increasing, and U.S. coal is increasingly exported to those markets.
The only threat to coal profits would be enforcement of environment and labor laws, but fighting for that would recognize that even so-called progressives are indeed users of coal, which is hard to nuance in a simple-minded fund-raising appeal or media event.
As for jobs, the solar and wind lobbies count every ancillarily involved contract as a job. The lawyer who draws up leases, the consultant who adapts the boilerplate environmental review, the concrete company that pours foundations, the lunch truck that hits a construction site on its rounds — these are all counted as “jobs in solar and wind”, even though they all existed before and will continue to exist after.
(According to Wikipedia, Koch Industries employs 50,000 people in the U.S. and 20,000 in other countries. Is that a justification per se for anything?)
wind power, wind energy, wind turbines, wind farms, environment, environmentalism, human rights, ecoanarchism
For the last few months, the Kochs and other big polluters have been spending heavily to fight incentives for renewable energy, which have been adopted by most states. They particularly dislike state laws that allow homeowners with solar panels to sell power they don’t need back to electric utilities. So they’ve been pushing legislatures to impose a surtax on this increasingly popular practice, hoping to make installing solar panels on houses less attractive.Whatever the intention driving the Kochs might be, there are a number of aspects to these battles that are ignored in this editorial. Like the targeted tax exemptions to favor one industry group, “incentives for renewable energy” are shamelessly biased. If the goal were truly to reduce carbon emissions or pollution, then that would be the stated requirement. Instead, these laws specify only the theoretical means, usually limited to wind and solar, not allowing hydro, and often specifying in-state generation. Furthermore, they make no provisions for monitoring the results on emissions. In effect, they simply tell utilities which suppliers they can and can not buy from without regard to actual effect. Indeed, one of the changes being fought by the wind industry in Ohio is to simply remove those purchasing directives from the renewables and efficiency standards, i.e., to let the utilities, not industry lobbyists, determine how best to achieve the goals.
As for net-metering, it is far from the equal exchange implied in the editorial. While homeowners get to install solar panels on the cheap by using the grid as a battery, net-metering laws generally require utilities to pay a hefty premium for taking the overflow. So not only are solar panel owners relying on a grid they no longer pay for, utilities have to pay them handsomely for dumping their excess production. Hence the logic of a tax on solar panels: to help pay for the grid that they continue to use.
Demonizing the Koch brothers, “big polluters”, and “big carbon” in these discussions is no more acceptable than the demonizing of all things Obama that the editorial decries about “Koch Carbon” ads. Nor is automatically defending all things Obama. In fact, Ken Lay of Enron, with the help of George W. Bush, essentially created the modern wind industry as a heavily subsidized darling of environmentalists. (Bush was keynote speaker at the 2010 American Wind Energy Association conference.)
The coal producers’ motivation is clear: They see solar and wind energy as a long-term threat to their businesses. ... Renewables are good for economic as well as environmental reasons, as most states know. (More than 143,000 now work in the solar industry.)Coal isn’t even a part of Koch Industries activities. Piping natural gas, however, is, and in terms of actual electricity production, natural gas is the fastest growing source, driven in large part by the need for generators that can react quickly enough to the highly fluctuating production of wind. (Ironically, if it did not have to contend with wind, natural gas generators could be built to be almost twice as efficient.)
Nor is coal threatened by solar and wind. It is the increase of natural gas that has reduced coal’s share of electricity generation. Because it takes several hours for a large coal plant to start up, it can not shut down as solar and especially wind production rises, because that production will fall again, usually unpredictably. That means coal must still be burned even while not producing electricity. Furthermore, world demand for (cheap) electricity is only increasing, and U.S. coal is increasingly exported to those markets.
The only threat to coal profits would be enforcement of environment and labor laws, but fighting for that would recognize that even so-called progressives are indeed users of coal, which is hard to nuance in a simple-minded fund-raising appeal or media event.
As for jobs, the solar and wind lobbies count every ancillarily involved contract as a job. The lawyer who draws up leases, the consultant who adapts the boilerplate environmental review, the concrete company that pours foundations, the lunch truck that hits a construction site on its rounds — these are all counted as “jobs in solar and wind”, even though they all existed before and will continue to exist after.
(According to Wikipedia, Koch Industries employs 50,000 people in the U.S. and 20,000 in other countries. Is that a justification per se for anything?)
That line might appeal to Tea Partiers, but it’s deliberately misleading. This campaign is really about the profits of Koch Carbon and the utilities, which to its organizers is much more important than clean air and the consequences of climate change.Again, this editorial might appeal to Obama apologists and corporate-allied environmentalists, but it does so by being deliberately misleading.
wind power, wind energy, wind turbines, wind farms, environment, environmentalism, human rights, ecoanarchism
April 18, 2014
Grass-Fed Beef Won’t Save the Planet
George Wuerthner, January 22, 2010
Excerpts:
Researcher Nathan Pelletier of Nova Scotia has found that GHG emissions are 50 percent higher from grass-fed than from feedlot cows.
One of the major consequences of having cattle roaming the range is soil compaction. Soil compaction reduces water penetration, creating more run-off and erosion. Because water cannot percolate into the soil easily, soil compaction from cattle creates more arid conditions — a significant problem in the already arid West, but also an issue in the East since the soils are often moister for a longer period of time. Moist soils are more easily compacted. Soil compaction also reduces the space in the top active layer of soil where most soil microbes live, reducing soil fertility.
There are far more ecological problems I could list for grass-fed beef, but suffice to say cattle production of any kind is not environmentally friendly.
The further irony of grass-fed beef is that consumption of beef products is not healthy despite claims to the contrary. There may be less fat in grass-fed beef, but the differences are not significant enough to warrant the claim that beef consumption is “healthy.” There is a huge body of literature about the contribution of red meat to major health problems including breast, colon, stomach, bladder, and prostate cancer. The other dietary related malady is the strong link between red meat consumption and heart disease.
Another health claim is that grass-fed beef has more omega-3 fats, which are considered important for lowering health attack risks. However, the different between grain-fed and grass-fed is so small as to be insignificant, not to mention there are many other non-beef sources for this: Walnuts, beans, flax seeds, winter squash, and olive oil are only some of the foods that provide concentrated sources of omega-3 fats. Arguing that eating grass-fed beef is necessary or healthier grain-fed beef is like claiming it is better to smoke a filtered cigarette instead of a non-filtered one.
environment, environmentalism, animal rights, vegetarianism, veganism
Excerpts:
Researcher Nathan Pelletier of Nova Scotia has found that GHG emissions are 50 percent higher from grass-fed than from feedlot cows.
One of the major consequences of having cattle roaming the range is soil compaction. Soil compaction reduces water penetration, creating more run-off and erosion. Because water cannot percolate into the soil easily, soil compaction from cattle creates more arid conditions — a significant problem in the already arid West, but also an issue in the East since the soils are often moister for a longer period of time. Moist soils are more easily compacted. Soil compaction also reduces the space in the top active layer of soil where most soil microbes live, reducing soil fertility.
There are far more ecological problems I could list for grass-fed beef, but suffice to say cattle production of any kind is not environmentally friendly.
The further irony of grass-fed beef is that consumption of beef products is not healthy despite claims to the contrary. There may be less fat in grass-fed beef, but the differences are not significant enough to warrant the claim that beef consumption is “healthy.” There is a huge body of literature about the contribution of red meat to major health problems including breast, colon, stomach, bladder, and prostate cancer. The other dietary related malady is the strong link between red meat consumption and heart disease.
Another health claim is that grass-fed beef has more omega-3 fats, which are considered important for lowering health attack risks. However, the different between grain-fed and grass-fed is so small as to be insignificant, not to mention there are many other non-beef sources for this: Walnuts, beans, flax seeds, winter squash, and olive oil are only some of the foods that provide concentrated sources of omega-3 fats. Arguing that eating grass-fed beef is necessary or healthier grain-fed beef is like claiming it is better to smoke a filtered cigarette instead of a non-filtered one.
environment, environmentalism, animal rights, vegetarianism, veganism
Important new molecule in the biology of dementia
Anthony L. Komaroff, NEJM Journal Watch, April 8, 2014
Two molecules — β-amyloid and tau — are important in the biology of Alzheimer disease. Yet, high concentrations of them, either alone or together, do not seem to be sufficient to cause the disease.
In a study in the March 27 issue of Nature (http://dx.doi.org/10.1038/nature13163), researchers evaluated the molecules produced in the brains of older people with preserved cognitive function or with dementia and identified a candidate molecule called REST, which is important in embryonic brain development. The production of REST is silenced after embryonic development is completed, but is turned back on in aging brains. The researchers discovered that production continues in healthy older people with preserved cognition — but switches off in people with mild cognitive impairment, Alzheimer disease, or one of several other dementing diseases. REST deficiency was most striking in areas that are most affected in Alzheimer disease. Experiments showed that REST protects neurons from the toxic effects of β-amyloid and oxidative stress and protects against apoptosis (which is programmed cell death). Deleting the gene for REST in mice led to age-related neurodegeneration.
The REST molecule might protect the brain against age-related degenerative diseases, including Alzheimer disease. This molecule now becomes an important focus in understanding the underlying biology of dementia, as well as a target for therapeutics. Not all new and exciting putative disease-related molecules stand the test of time, but many experts are betting that this one will.
[[[[ ]]]]
REST and stress resistance in ageing and Alzheimer’s disease
Tao Lu, Liviu Aron, Joseph Zullo, Ying Pan, Haeyoung Kim, Yiwen Chen, Tun-Hsiang Yang, Hyun-Min Kim, Derek Drake, X. Shirley Liu, David A. Bennett, Monica P. Colaiácovo & Bruce A. Yankner
Nature 507, 448–454 (27 March 2014) doi:10.1038/nature13163
Abstract
Human neurons are functional over an entire lifetime, yet the mechanisms that preserve function and protect against neurodegeneration during ageing are unknown. Here we show that induction of the repressor element 1-silencing transcription factor (REST; also known as neuron-restrictive silencer factor, NRSF) is a universal feature of normal ageing in human cortical and hippocampal neurons. REST is lost, however, in mild cognitive impairment and Alzheimer’s disease. Chromatin immunoprecipitation with deep sequencing and expression analysis show that REST represses genes that promote cell death and Alzheimer’s disease pathology, and induces the expression of stress response genes. Moreover, REST potently protects neurons from oxidative stress and amyloid β-protein toxicity, and conditional deletion of REST in the mouse brain leads to age-related neurodegeneration. A functional orthologue of REST, Caenorhabditis elegans SPR-4, also protects against oxidative stress and amyloid β-protein toxicity. During normal ageing, REST is induced in part by cell non-autonomous Wnt signalling. However, in Alzheimer’s disease, frontotemporal dementia and dementia with Lewy bodies, REST is lost from the nucleus and appears in autophagosomes together with pathological misfolded proteins. Finally, REST levels during ageing are closely correlated with cognitive preservation and longevity. Thus, the activation state of REST may distinguish neuroprotection from neurodegeneration in the ageing brain.
Two molecules — β-amyloid and tau — are important in the biology of Alzheimer disease. Yet, high concentrations of them, either alone or together, do not seem to be sufficient to cause the disease.
In a study in the March 27 issue of Nature (http://dx.doi.org/10.1038/nature13163), researchers evaluated the molecules produced in the brains of older people with preserved cognitive function or with dementia and identified a candidate molecule called REST, which is important in embryonic brain development. The production of REST is silenced after embryonic development is completed, but is turned back on in aging brains. The researchers discovered that production continues in healthy older people with preserved cognition — but switches off in people with mild cognitive impairment, Alzheimer disease, or one of several other dementing diseases. REST deficiency was most striking in areas that are most affected in Alzheimer disease. Experiments showed that REST protects neurons from the toxic effects of β-amyloid and oxidative stress and protects against apoptosis (which is programmed cell death). Deleting the gene for REST in mice led to age-related neurodegeneration.
The REST molecule might protect the brain against age-related degenerative diseases, including Alzheimer disease. This molecule now becomes an important focus in understanding the underlying biology of dementia, as well as a target for therapeutics. Not all new and exciting putative disease-related molecules stand the test of time, but many experts are betting that this one will.
REST and stress resistance in ageing and Alzheimer’s disease
Tao Lu, Liviu Aron, Joseph Zullo, Ying Pan, Haeyoung Kim, Yiwen Chen, Tun-Hsiang Yang, Hyun-Min Kim, Derek Drake, X. Shirley Liu, David A. Bennett, Monica P. Colaiácovo & Bruce A. Yankner
Nature 507, 448–454 (27 March 2014) doi:10.1038/nature13163
Abstract
Human neurons are functional over an entire lifetime, yet the mechanisms that preserve function and protect against neurodegeneration during ageing are unknown. Here we show that induction of the repressor element 1-silencing transcription factor (REST; also known as neuron-restrictive silencer factor, NRSF) is a universal feature of normal ageing in human cortical and hippocampal neurons. REST is lost, however, in mild cognitive impairment and Alzheimer’s disease. Chromatin immunoprecipitation with deep sequencing and expression analysis show that REST represses genes that promote cell death and Alzheimer’s disease pathology, and induces the expression of stress response genes. Moreover, REST potently protects neurons from oxidative stress and amyloid β-protein toxicity, and conditional deletion of REST in the mouse brain leads to age-related neurodegeneration. A functional orthologue of REST, Caenorhabditis elegans SPR-4, also protects against oxidative stress and amyloid β-protein toxicity. During normal ageing, REST is induced in part by cell non-autonomous Wnt signalling. However, in Alzheimer’s disease, frontotemporal dementia and dementia with Lewy bodies, REST is lost from the nucleus and appears in autophagosomes together with pathological misfolded proteins. Finally, REST levels during ageing are closely correlated with cognitive preservation and longevity. Thus, the activation state of REST may distinguish neuroprotection from neurodegeneration in the ageing brain.
April 9, 2014
The Wall, by Marlen Haushofer (1968)
I had washed my hair, and it now floated, light and bushy, around my head. The rainwater had made it soft and smooth. Looking in the mirror I cut it short so that it just covered my ears, and I contemplated my tanned face under its sun-bleached cap of hair. It looked very strange, thin, with slight hollows in the cheeks. Its lips had grown narrower, and I felt this strange face was marked by a secret need. As there were no human beings left alive to love this face it struck me as quite superfluous. It was naked and pathetic, and I was ashamed of it and wanted nothing to do with it. My animals were fond of my familiar smell, my voice and my movements. I could easily cast off my face; it was needed no longer. At this thought a feeling of emptiness rose up in me, which I had to get rid of at any price. I looked for some kind of work to do, and told myself that in my situation it was childish to mourn a face, but the tormenting sense that I had lost something important would not be driven away.
[[[ ]]]
I have always been fond of animals, in the slight and superficial way in which city people feel drawn to them. When they were suddenly all I had, everything changed. There are said to have been prisoners who have tamed rats, spiders and flies and begun to love them. I think they acted in accordance with their situation. The barriers between animal and human come down very easily. We belong to a single great family, and if we are lonely and unhappy we gladly accept the friendship of our distant relations. They suffer as we do if pain is inflicted on them, and like myself they need food, warmth and a little tenderness.
[[[ ]]]
But if time exists only in my head, and I’m the last human being, it will end with my death. The thought cheers me. I may be in a position to murder time. The big net will tear and fall, with its sad contents, into oblivion. I’m owed some gratitude, but no one after my death will know I murdered time. Really these thoughts are quite meaningless. Things happen, and, like millions of people before me, I look for a meaning in them, because my vanity will not allow me to admit that the whole meaning of an event lies in the event itself. If I casually step on a beetle, it will not see this event, tragic for the beetle, as a mysterious concatenation of universal significance. The beetle was beneath my foot at the moment when my foot fell; a sense of well-being in the daylight, a short, shrill pain and then nothing. But we’re condemned to chase after a meaning that cannot exist. I don’t know whether I will ever come to terms with that knowledge. It’s difficult to shake off an ancient, deep-rooted megalomania. I pity animals, and I pity people, because they’re thrown into this life without being consulted. Maybe people are more deserving of pity, because they have just enough intelligence to resist the natural course of things. It has made them wicked and desperate, and not very lovable. All the same, life could have been lived differently. There is no impulse more rational than love. It makes life more bearable for the lover and the loved one. We should have recognized in time that this was our only chance, our only hope for a better life. For an endless army of the dead, mankind’s only chance has vanished for ever. I keep thinking about that. I can’t understand why we had to take the wrong path. I only know it’s too late.
(translated by Shaun Whiteside)
I have always been fond of animals, in the slight and superficial way in which city people feel drawn to them. When they were suddenly all I had, everything changed. There are said to have been prisoners who have tamed rats, spiders and flies and begun to love them. I think they acted in accordance with their situation. The barriers between animal and human come down very easily. We belong to a single great family, and if we are lonely and unhappy we gladly accept the friendship of our distant relations. They suffer as we do if pain is inflicted on them, and like myself they need food, warmth and a little tenderness.
But if time exists only in my head, and I’m the last human being, it will end with my death. The thought cheers me. I may be in a position to murder time. The big net will tear and fall, with its sad contents, into oblivion. I’m owed some gratitude, but no one after my death will know I murdered time. Really these thoughts are quite meaningless. Things happen, and, like millions of people before me, I look for a meaning in them, because my vanity will not allow me to admit that the whole meaning of an event lies in the event itself. If I casually step on a beetle, it will not see this event, tragic for the beetle, as a mysterious concatenation of universal significance. The beetle was beneath my foot at the moment when my foot fell; a sense of well-being in the daylight, a short, shrill pain and then nothing. But we’re condemned to chase after a meaning that cannot exist. I don’t know whether I will ever come to terms with that knowledge. It’s difficult to shake off an ancient, deep-rooted megalomania. I pity animals, and I pity people, because they’re thrown into this life without being consulted. Maybe people are more deserving of pity, because they have just enough intelligence to resist the natural course of things. It has made them wicked and desperate, and not very lovable. All the same, life could have been lived differently. There is no impulse more rational than love. It makes life more bearable for the lover and the loved one. We should have recognized in time that this was our only chance, our only hope for a better life. For an endless army of the dead, mankind’s only chance has vanished for ever. I keep thinking about that. I can’t understand why we had to take the wrong path. I only know it’s too late.
(translated by Shaun Whiteside)
March 31, 2014
The importance of reduced meat and dairy consumption for meeting stringent climate change targets
Abstract
For agriculture, there are three major options for mitigating greenhouse gas (GHG) emissions: 1) productivity improvements, particularly in the livestock sector; 2) dedicated technical mitigation measures; and 3) human dietary changes. The aim of the paper is to estimate long-term agricultural GHG emissions, under different mitigation scenarios, and to relate them to the emissions space compatible with the 2 °C temperature target. Our estimates include emissions up to 2070 from agricultural soils, manure management, enteric fermentation and paddy rice fields, and are based on IPCC Tier 2 methodology. We find that baseline agricultural CO₂-equivalent emissions (using Global Warming Potentials with a 100 year time horizon) will be approximately 13 Gton CO₂eq/year in 2070, compared to 7.1 Gton CO₂eq/year 2000. However, if faster growth in livestock productivity is combined with dedicated technical mitigation measures, emissions may be kept to 7.7 Gton CO₂eq/year in 2070. If structural changes in human diets are included, emissions may be reduced further, to 3–5 Gton CO₂eq/year in 2070. The total annual emissions for meeting the 2 °C target with a chance above 50 % is in the order of 13 Gton CO₂eq/year or less in 2070, for all sectors combined. We conclude that reduced ruminant meat and dairy consumption will be indispensable for reaching the 2 °C target with a high probability, unless unprecedented advances in technology take place.
Fredrik Hedenus, Stefan Wirsenius, Daniel J. A. Johansson
Department of Energy and Environment, Chalmers University of Technology, Gothenburg, Sweden
Climatic Change. Published online 28 March 2014.
doi:10.1007/s10584-014-1104-5
environment, environmentalism, animal rights, vegetarianism, veganism
For agriculture, there are three major options for mitigating greenhouse gas (GHG) emissions: 1) productivity improvements, particularly in the livestock sector; 2) dedicated technical mitigation measures; and 3) human dietary changes. The aim of the paper is to estimate long-term agricultural GHG emissions, under different mitigation scenarios, and to relate them to the emissions space compatible with the 2 °C temperature target. Our estimates include emissions up to 2070 from agricultural soils, manure management, enteric fermentation and paddy rice fields, and are based on IPCC Tier 2 methodology. We find that baseline agricultural CO₂-equivalent emissions (using Global Warming Potentials with a 100 year time horizon) will be approximately 13 Gton CO₂eq/year in 2070, compared to 7.1 Gton CO₂eq/year 2000. However, if faster growth in livestock productivity is combined with dedicated technical mitigation measures, emissions may be kept to 7.7 Gton CO₂eq/year in 2070. If structural changes in human diets are included, emissions may be reduced further, to 3–5 Gton CO₂eq/year in 2070. The total annual emissions for meeting the 2 °C target with a chance above 50 % is in the order of 13 Gton CO₂eq/year or less in 2070, for all sectors combined. We conclude that reduced ruminant meat and dairy consumption will be indispensable for reaching the 2 °C target with a high probability, unless unprecedented advances in technology take place.
Fredrik Hedenus, Stefan Wirsenius, Daniel J. A. Johansson
Department of Energy and Environment, Chalmers University of Technology, Gothenburg, Sweden
Climatic Change. Published online 28 March 2014.
doi:10.1007/s10584-014-1104-5
environment, environmentalism, animal rights, vegetarianism, veganism
February 22, 2014
The real agenda of school choice opponents: protecting privilege
Perhaps Steve Nelson should have heeded his feelings of “caution and ambivalence” before submitting his jeremiad against school choice (“Real Agenda of School-Choice Advocates,” Valley News [West Lebanon, N.H.], January 5). It is difficult to imagine a more awkward and inappropriate source of such a lamentation than the head of an expensive private school in Manhattan [The Calhoun School].
Nelson is rightly concerned about quality, but erroneously states, “The one comprehensive study done to date shows that charters on balance do slightly worse than the public schools they replaced.” Assuming that he is referring to the “National Charter School Study” by the Stanford University Center for Research on Education Outcomes (CREDO), the 2013 report actually states that “charter schools now advance the learning gains of their students more than traditional public schools in reading[, and] academic growth of charter students in math [...] is now comparable to the learning gains in traditional public schools.” CREDO also separately studied Louisiana, which Nelson singled out for condemnation: “The charter school sector in Louisiana has a trend of strong results.”
Obviously, not all private or charter schools are commendable, voucher systems are far from ideal, and profiteers exploiting a real need are rightly decried. But students who are failed by their public school don’t have time to wait for improvements. They need those alternatives now. It certainly doesn’t help to accuse their parents of tearing apart “the connective tissue of our nation” for trying to do what’s best for their children.
Since Nelson defended his own alternative school as decidedly not rending “America’s social fabric,” he would have done better to suggest more progressive ways to expand such options for others. As noted by Ginia Bellafante in the same day’s New York Times, Mayor Bill De Blasio’s newly appointed Schools Chancellor, Carmen Fariña, has high praise for a network of charter schools serving the poorest neighborhoods of Brooklyn. And the cover story of the Valley News featured the Ledyard Charter School, which impressively meets the needs of many area students for an alternative to the regular high schools. Not only the schools and students, but society as a whole would clearly benefit from more support for such alternatives.
A progressive approach to education requires choice for all, not just the rich.
human rights, Vermont
Nelson is rightly concerned about quality, but erroneously states, “The one comprehensive study done to date shows that charters on balance do slightly worse than the public schools they replaced.” Assuming that he is referring to the “National Charter School Study” by the Stanford University Center for Research on Education Outcomes (CREDO), the 2013 report actually states that “charter schools now advance the learning gains of their students more than traditional public schools in reading[, and] academic growth of charter students in math [...] is now comparable to the learning gains in traditional public schools.” CREDO also separately studied Louisiana, which Nelson singled out for condemnation: “The charter school sector in Louisiana has a trend of strong results.”
Obviously, not all private or charter schools are commendable, voucher systems are far from ideal, and profiteers exploiting a real need are rightly decried. But students who are failed by their public school don’t have time to wait for improvements. They need those alternatives now. It certainly doesn’t help to accuse their parents of tearing apart “the connective tissue of our nation” for trying to do what’s best for their children.
Since Nelson defended his own alternative school as decidedly not rending “America’s social fabric,” he would have done better to suggest more progressive ways to expand such options for others. As noted by Ginia Bellafante in the same day’s New York Times, Mayor Bill De Blasio’s newly appointed Schools Chancellor, Carmen Fariña, has high praise for a network of charter schools serving the poorest neighborhoods of Brooklyn. And the cover story of the Valley News featured the Ledyard Charter School, which impressively meets the needs of many area students for an alternative to the regular high schools. Not only the schools and students, but society as a whole would clearly benefit from more support for such alternatives.
A progressive approach to education requires choice for all, not just the rich.
human rights, Vermont
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