IT IS perhaps the most iconic symbol of life on our planet. The Amazon is the world's largest and most biodiverse tropical rainforest, and an immense trap for carbon dioxide. The perils of deforestation in this vital resource are old news. But now, the time on the clock is running out. It seems that the world's biggest rainforest is about to turn into the world's biggest environmental disaster. "We are about to collapse," says Luciana Gatti at Brazil's National Institute for Space Research. "We are in an emergency, we need action now."
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