WASHINGTON (AP) — With just two years left in power, President Barack Obama is elevating his efforts to combat global warming as he seeks to leave an imprint on the world that will endure after he's gone. It's a strategy rooted not only in Obama's long-stated support for such efforts, but also in political reality. Two weeks ago, Obama watched his prospects for realizing his goals on education, wages and immigration all but evaporate as voters handed his party a stinging rebuke in the midterms, putting Republicans in full control of Congress for the remainder of his presidency.