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U.S. Christmas decorations use more energy than many nations do in a year

The double-edged sword of cheap gas

4 things to know about the Paris climate deal

CO2 emissions stall, even as economy grows

Why the Paris climate talks might actually work

Why I'll never trust Volkswagen again

Toyota's 2016 Prius puts on a show in Vegas

Fuel economy hasn't improved in 100 years

Watch out! Urban grime is going airborne