There are more habitable planets in our galaxy than humans living on planet Earth. But the nearest one is about 70 trillion miles away , which means that, for now, and for the foreseeable future, Earth is the only life-supporting rock hurtling through infinite space we’ll ever know. It’s really not the best idea to let it burn up–and key to keeping it cool are the massive rainforests of the Amazon. Sadly, we’ve had a hard time not cutting them down.

A new project should help prevent–or at least slow down–that hot future. If all goes to plan over the next six years, a project led by Conservation International will become the largest tropical reforestation project in history. Seventy-three million trees will sprout up across what’s known as the “arc of deforestation,” in the Brazilian states of Amazonas, Acre, Pará, Rondônia, and throughout the Xingu watershed. …
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