The Amazon rain forest is near a survival tipping point

Global warming and deforestation are combining to dry out rain forests, which could start an unstoppable cycle that turns them to grasslands. The Amazon rain forest, like other tropical forests, depends on rain to survive: Once rainfall drops to a certain level, the forest can dry out, burn, and start to turn into a savannah. A new study suggests that a huge swath of the Amazon forest—around 40%—is already at the point where that transition is at risk of happening. Read Full Story
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