Sites containing some of the world's most treasured forests, including the Yosemite National Park and Indonesia's Sumatra rainforest, have been emitting more heat-trapping carbon dioxide than they have absorbed in recent years, a UN-backed report said.
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"All forests should be assets in the fight against climate change," said Tales Carvalho Resende, a co-author of the report who works at Paris-based UNESCO. "Our report's finding that even some of the most iconic and best protected forests, such as those found in World Heritage sites, can actually contribute to climate change is alarming."
All told, however, the net carbon emissions from the 10 sites together amount to little compared to the total of roughly 190 million tons of carbon dioxide that are absorbed each year by all 257 UNESCO-listed forests. Of those, about 80 sites were net neutral, while the rest were net absorbers of carbon.
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