As the Obama administration weans the U.S. off dirty fuels blamed for global warming, energy companies have been sending more of America's unwanted energy leftovers to other parts of the world where they could create even more pollution.

This fossil fuel trade threatens to undermine President Barack Obama's strategy for reducing the gases blamed for climate change and reveals a little-discussed side effect of countries acting alone on a global problem. The contribution of this exported pollution to global warming is not something the administration wants to measure, or even talk about.

"This is the single biggest flaw in U.S. climate policy," said Roger Martella, the former general counsel at the Environmental Protection Agency under President George W. Bush. "Although the administration is moving forward with climate change regulations at home, we don't consider how policy decisions in the United States impact greenhouse gas emissions in other parts of the world."

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