To solve any problem, you must be optimistic that you can find a solution. The problem of climate change is no different. We're joined by Dr. Michael Mann of Penn State, who's been studying climate science for decades, to talk the climate reality we're dealing with and to answer some calls. Mann gives caller Jacob some strategies for conversing with climate change skeptics, and he answers Emma's critical question: What is the single most important thing we can do right now to alleviate the pressures from climate change?

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