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Sugarcane cools climate
Date:4/17/2011

Palo Alto, CABrazilians are world leaders in using biofuels for gasoline. About a quarter of their automobile fuel consumption comes from sugarcane, which significantly reduces carbon dioxide emissions that otherwise would be emitted from using gasoline. Now scientists from the Carnegie Institution's Department of Global Ecology have found that sugarcane has a double benefit. Expansion of the crop in areas previously occupied by other Brazilian crops cools the local climate. It does so by reflecting sunlight back into space and by lowering the temperature of the surrounding air as the plants "exhale" cooler water. The study is published in the 2nd issue of Nature Climate Change, posted on-line April 17.

The research team,* led by Carnegie's Scott Loarie, is the first to quantify the direct effects on the climate from sugarcane expansion in areas of existing crop and pastureland of the cerrado, in central Brazil.

The researchers used data from hundreds of satellite images over 733,000 square milesan area larger than the state of Alaska. They measured temperature, reflectivity (also called albedo), and evapotranspirationthe water loss from the soil and from plants as they exhale water vapor.

As Loarie explained: "We found that shifting from natural vegetation to crops or pasture results in local warming because the plants give off less beneficial water. But the bamboo-like sugarcane is more reflective and gives off more watermuch like the natural vegetation. It's a potential win-win for the climateusing sugarcane to power vehicles reduces carbon emissions, while growing it lowers the local air temperature."

The scientists found that converting from natural vegetation to crop/pasture on average warmed the cerrado by 2.79 F (1.55 C), but that subsequent conversion to sugarcane, on average, cooled the surrounding air by 1.67 F (0.93C).

The researchers emphasize that the beneficial effects are contingent on the fa
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Contact: Scott Loarie
loarie@gmail.com
650-462-1047
Carnegie Institution
Source:Eurekalert

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