Reuters: U.S. emissions of gases blamed for warming the planet rose 1.4 percent last year as acute weather pushed consumers to crank up heaters and air conditioners and cut output from hydropower generation, the federal Energy Information Administration said on Wednesday. The rise in the pollution level made President elect Barack Obama’s goal of cutting U.S. greenhouse gas emissions to 1990 levels by 2020 more ambitious. U.S. emissions last year were about 16.7 percent above 1990 …