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Part 3: This week, when the science of climate change is getting a very critical look, we talk to David Grinspoon, astrobiologist at the Planetary Science Institute and author of “Earth in Human Hands.” He breaks down the impact of humans on our planet, and what we would need to do to actually expand civilization to other planets while adjusting for past mistakes. We also find out what he thinks of the latest crop of sci-fi movies.
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