The Amazon rainforest and the global climate are on the line Sunday, when Brazilians go to the polls to choose between President Jair Bolsonaro and his challenger, former President Luiz Inácio Lula da Silva. ⬇️

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The two candidates promise near-opposite fates for the Amazon, at a crucial moment when the rainforest is teetering on the edge of a dangerous tipping point.

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If deforestation continues there at current rates, the Amazon will pass an irreversible threshold in just a decade or two, dooming it to turn into a savanna and release billions of tons of heat-trapping gases, scientists warn.

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Bolsonaro promises to increase deforestation in the Amazon, while Lula promises to slow it.

Neither of them gained majority support in a first round of voting, so they go to a runoff election on Sunday. Polls have shown them neck-and-neck.

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