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Environmentalist warns continuing to use fossil fuels could lead to human extinction

Coal and other fossil fuels are still ingrained in infrastructure around the globe, and transitioning to renewable energy is no easy task. But scientists warn that if we don't make drastic changes in the coming years, climate change could devastate civilization as we know it. Bill McKibben, environmentalist and author of "Falter: Has the Human Game Begun to Play Itself Out?," explains the serious dangers of not taking action.
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