Yearly carbon emissions from the world’s forests have dropped by more than 25 percent in the last 15 years, a U.N. agency said on Friday.

The decrease in annual emissions, which cause global warming, is largely due to slowing rates of global deforestation, the Food and Agriculture Organisation (FAO) reported.

Forests hold about three quarters as much carbon as the atmosphere and preserving them is crucial for combating climate change.

“Deforestation and forest degradation increase the concentration of greenhouse gases in the atmosphere, but forest and tree growth absorbs carbon dioxide, the main greenhouse gas emissions,” FAO director-general Jose Graziano da Silva said in a statement.

Emissions from deforestation decreased to 2.9 Gigatonnes of carbon dioxide from 3.9 Gigatonnes between 2001 and 2015, the FAO said.

Brazil, Chile, China, Cape Verde, Costa Rica, the Philippines, Turkey, Korea, Uruguay and Vietnam have all seen net decreases in deforestation, da Silva said.

Africa, Asia and Latin America and the Caribbean all continued to release more carbon than they absorb, the study said. Total emissions from Africa and Latin America, however, decreased between 1990 and 2015, the FAO said.

Brazil alone represented more than 50 percent of the overall estimated reduction in annual carbon emissions from forests between 2001 and 2015, the FAO said.

“In Brazil, it’s a matter of the government changing its policies and laws to restrict the amount of forest land being cleared for agriculture,” Kenneth MacDicken, a senior FAO forestry official told the Thomson Reuters Foundation.

“It’s a huge accomplishment.”

This article is published in collaboration with Thomson Reuters Foundation Publication does not imply endorsement of views by the World Economic Forum.

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Author: Chris Arsenault covers global food security and agricultural politics for the Thomson Reuters Foundation from Rome.

Image: A view is seen from the Amazon Tall Tower Observatory (ATTO) in Sao Sebastiao do Uatuma in the middle of the Amazon forest in Amazonas state January 10, 2015. REUTERS/Bruno Kelly