Inspired by an article in Nature by 22 scientists led by Anthony Barnosky, Bill Moyer contemplates how we're letting the future down. As he recounts, the article describes how, "In the lifetime of these graduates, Earth could reach a tipping point...the planet could be plunged into uncharted territory from which there is no return," but he notes, "These scientists are parents and grandparents too, and they reject despair."

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