Climate benefits of changing diet

Elke Stehfest (1), Lex Bouwman (1,2), Detlef P. van Vuuren (1), Michel G. J. den Elzen (1), Bas Eickhout (1), and Pavel Kabat (2)

(1) Netherlands Environmental Assessment Agency, Global Sustainability and Climate, Bilthoven
(2) Earth System Science and Climate Change Group, Wageningen University Research Centre, The Netherlands

Climatic Change 2009;95(1-2):83-102

Abstract: Climate change mitigation policies tend to focus on the energy sector, while the livestock sector receives surprisingly little attention, despite the fact that it accounts for 18% of the greenhouse gas emissions and for 80% of total anthropogenic land use. From a dietary perspective, new insights in the adverse health effects of beef and pork have lead to a revision of meat consumption recommendations. Here, we explored the potential impact of dietary changes on achieving ambitious climate stabilization levels. By using an integrated assessment model, we found a global food transition to less meat, or even a complete switch to plant-based protein food to have a dramatic effect on land use. Up to 2,700 Mha of pasture and 100 Mha of cropland could be abandoned, resulting in a large carbon uptake from regrowing vegetation. Additionally, methane and nitrous oxide emission would be reduced substantially. A global transition to a low meat-diet as recommended for health reasons would reduce the mitigation costs to achieve a 450 ppm CO2-eq. stabilisation target by about 50% in 2050 compared to the reference case. Dietary changes could therefore not only create substantial benefits for human health and global land use, but can also play an important role in future climate change mitigation policies.

[Click here to download PDF]

environment, environmentalism, animal rights, vegetarianism

Snowmobiling into the apocalypse

Chris Kelly begins "Sarah Palin's $159,050 Conflict of Interest" at Huffington Post:

While you read this, Alaska's First Dude, Todd Palin, is riding a snowmobile -- I'm sorry, snow machine -- 1,971 miles from Big Lake to Fairbanks. In the course of performing this awesome feat, his Arctic Cat's powerful two-stroke engine will emit the same amount of hydrocarbons as an automobile driving from Chicago to San Francisco and back 150 times.

A small price for the rest of us to pay to honor the indomitability of the human spirit and one man's ability to sit and hold on.

It's not just a blaze of glory and aromatic hydrocarbon. A conventional two-stroke engine emits as much as a quarter of its fuel unburned, directly into the air. This week, as a participant in the Iron Dog snow machine race, Todd Palin will release as many cancer-causing and smog-forming pollutants as a Chevy Malibu driven around the Earth at its equator 28 times.

Click the title of this post for the rest of the article.

environment, environmentalism

Wind energy on the grid is not green

An associate has written to the Climate Trust's climatecounter.org, regarding their support of wind energy green tags from Bonneville Environmental Foundation:

"The electricity generated by the co-funded wind facility displaced electricity that otherwise would have been generated by burning fossil fuel at other power plants."

That may or may not be the case (if the amount of wind is a small enough percentage, the grid most likely just allows the line voltage to rise withing tolerable limits). Isn't the true measure, however, the amount of fuel burning that is reduced? The calculation of displacement has to account for: 1) the preference of hydro to balance wind; 2) switching thermal plants to standby, in which they still burn fuel to stay warmed up and ready to switch back to generation; 3) the extra fuel necessary for more frequent ramping or less efficient operation of those plants that are able to switch more quickly; and 4) the likelihood that the addition of wind energy is simply absorbed as a tolerable rise in line voltage.

These factors may explain why there is no evidence from anywhere in the world that wind energy on the grid actually reduces fossil fuel use or emissions, despite more than a decade of extensive experience, and casts serious doubt on wind's green credentials.

wind power, wind energy, environment, environmentalism