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A future with or without trees
Date:7/27/2010

MBL, WOODS HOLE, MAIn some cases, it can be difficult for scientists to see the deforestation for the trees.

Not so for Gillian Galford, a recent graduate of the Brown-MBL Graduate Program in Biological and Environmental Sciences (and now a post-doctoral fellow at Columbia University's Earth Institute) and her colleagues, who take a big-picture approach to greenhouse gas emissions.

In a study published in Proceedings of the National Academy of Sciences, the team estimates future emissions of carbon dioxide, nitrous oxide, and methane in the Brazilian Amazon state of Mato Grosso. The estimates were made by combining 105 years of historical data on land-use changes with possible scenarios for future deforestation and land use in the region.

The results indicate that a recent pledge by the government of Mato Grosso to reduce deforestation rates by 89 percent by 2020 would be an effective way to minimize future greenhouse gas emissions.

"Our study shows not only that Mato Grosso can perhaps achieve this goal, but, if they stick with it, we now have an estimate of what their greenhouse gas emissions would be," says Galford, who completed the research as part of her Ph.D. thesis for the Brown-MBL joint graduate program. "If they can adhere to their own goal, they are going to have much lower net emissions than they would if they followed the trajectory they were on."

Galford and her colleagues considered two scenarios for future land-use change in Mato Grosso. In the business-as-usual scenario, deforestation and land-use changes occur at the same rapid rates associated with the early 21st century, when native forest and grasslands were being rapidly converted for agricultural uses. The governance scenario, which better reflects trends of the past few years, takes into account the state pledge to reduce deforestation. This scenario results in over 2 times lower greenhouse gas emissions estimated through 2050 (6.3 Pg
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Contact: Diana Kenney
dkenney@mbl.edu
508-289-7139
Marine Biological Laboratory
Source:Eurekalert  

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