By 2050, up to 47 percent of the Amazon could hit critical ecological tipping points, researchers say, transitioning into savanna grasslands or other degraded ecosystems because of deforestation and human-driven global warming.
The study's authors list five critical thresholds, or tipping points, that shouldn't be passed, including keeping global warming to under 2 degrees Celsius, or 3.6 degrees Fahrenheit, compared with preindustrial levels (one of the goals outlined in the 2015 Paris agreement), keeping annual rainfall in the Amazon above 1,000 millimeters and containing deforestation to 20 percent.
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