WGBH: This year we’ve seen what many experts agree are real symptoms of global warming – from fires in Colorado to drought that has afflicted more than 60% of the country. And this July was the hottest ever for those of us in the lower 48. Except that it wasn’t just July. The average temperature from last summer to this summer is hotter than any 12 month period on record in the U.S. So, what’s going on here? We dive into the science — and the politics — with author and activist Bill McKibben and…

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