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The fact that the climate is changing is an incontrovertible fact. If we do nothing – or fall short of what is needed – human beings as a species are headed toward unprecedented disaster.   Our guest in this episode, Dr. Ruth DeFries, Professor of Ecology and Sustainable Development at Columbia University and Co-founding Dean of the Columbia Climate School, is one of the people committed to addressing the factors driving climate change and helping us see a path other than the one we are on.  In this episode, Dr. DeFries discusses how we’ve passed humanity’s climate “period of grace” and why we should immediately reduce planet-warming emissions while preparing for an unstable climate future.