There are many reasons hundreds of thousands of migrants are making the dangerous trek from Central America — and even farther away — to get to our southern border.

And, according to The Show's guest, one of them is climate change.

Todd Miller is based in Tucson and is the author of the book "Storming the Wall: Climate Change, Migration and Homeland Security."

He said climate change is making it impossible for many people around the world not to move.

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