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As the news of fires raging in the Amazon spread across the world last week, so did a misleading yet oft-repeated claim about the rainforest’s importance: that it produces 20 percent of the world’s oxygen.
That claim appears in news coverage from CNN, ABC News, Sky News, and others, and in social media posts by politicians and celebrities, such as French president Emmanuel Macron, U.S. Senator and presidential candidate Kamala Harris, and actor and environmentalist Leonardo di Caprio.