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Ben Geman Apr 2
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EPA moves to weaken Obama-era mileage regulations

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Photo: Scott Olson / Getty Images

The Environmental Protection Agency announced Monday a long-expected decision to begin scaling back mileage and carbon emissions rules for cars and light trucks.

Why it matters: The regulations were a pillar of President Obama's climate change agenda. The move may also set up a major battle with California, which currently has authority to maintain tougher mileage rules, and roughly a dozen states that follow California's lead.