Associated Press: Americans’ day-to-day lives won’t change noticeably if President Barack Obama achieves his newly announced goal of slashing carbon dioxide pollution by one-sixth in the next decade, experts say. Except for rising energy bills. And how much they’ll go up depends on who’s doing the calculating. The White House will commit the U.S. to a goal of cutting carbon dioxide emissions in 2010 to about 17 percent below 2005 levels at a U.N.-sponsored climate change summit in Copenhagen …