KAI RYSSDAL: There's a technical term for what we're doing as we eat, shop, drive and go about our daily lives. The word is "overshoot" -- when a population uses up resources faster than they can be replaced.
Today, we're consuming about 30 percent more trees, fish and fossil fuels than the planet can regenerate. We can run a deficit like this for a little while, but there are limits to how big a hole we can dig before it gets too deep to get out of.
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