How Amazon deforestation could push the climate to a 'tipping point'

The Amazon is the world’s largest rainforest and a critical line of defense against climate change. But it’s been steadily deforested since the 1970s, with nearly 20 percent of its land area wiped out. This year, pervasive forest fires destroyed vast expanses of rainforest, and Brazil’s growing agribusiness is poised to transform more into farmland. Amna Nawaz reports from Mato Grosso, Brazil.
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