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The Amazon rainforest in South America is a carbon sink that is essential to slowing global warming. Water evaporating from the trees also forms rain clouds, providing the rain needed to sustain life. But now a massive drought is causing these mechanisms to break down. Plant ecologists working in the Amazon say they expect a repeat of the 2015 drought, which wiped out an estimated 2.5 billion plant species. BBC population correspondent Stephanie Hegarty reports. Read the article on the BBC News site here: https://www.bbc.com/japanese/articles... Subscribe to the BBC on YouTube here: http://goo.gl/tYDMwU Follow BBC News on Twitter in Japanese here: / bbcnewsjapan