| A new study in the journal Nature Climate Change suggests that 75 percent of the Amazon has lost resilience in recent decades, a worrying sign that the world's largest rainforest is close to a "tipping point." If humanity does not address deforestation and climate change, scientists say, huge swaths of the forest could be replaced by savanna — a shift that would imperil species, disrupt weather systems and release billions of tons of carbon into the atmosphere. | 
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