(AP) — 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. "There may be a very marginal increase in coal exports caused by our climate policies," said Rick Duke, Obama's deputy climate adviser, in an interview with The Associated Press. Changing the global system to account for production would carry political risks, especially for the U.S., which is trying to boost production of energy and exports even as it addresses global warming. If our coal exports are very small and having no or little impact on global greenhouse gas emissions ...