Originally published on Tue November 13, 2012 4:18 pm
California begins a controversial experiment to curb climate change on Wednesday: The state will start rationing the amount of greenhouse gases companies can emit.
It's the most ambitious effort to control climate change in the country. Some say the plan will cost dearly; supporters say it's the route to a cleaner economy.
Here's how the climate deal works. Big companies must limit the greenhouse gases they emit — from smokestacks to tailpipes — and they have to get permits for those emissions. The clock starts Jan. 1.
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