General Motors announced Tuesday that its long-awaited Chevrolet Volt hybrid, a battery- and gas-powered electric vehicle, can get 230 miles per gallon in city driving, dwarfing every other car on the market in fuel efficiency.

The Environmental Protection Agency on Friday delayed making a decision about whether human health and welfare are being harmed by greenhouse gas pollution. In a federal notice, the agency instead called for more public comment, essentially bumping the decision to…

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