Reuters: U.S. greenhouse gas emissions rose 1.4 percent last year on unfavorable weather that boosted demand for heating and cooling and as generation from hydropower sources declined, the Energy Information Administration said on Wednesday. U.S. emissions of gases blamed for warming the planet last year were about 16.7 percent above the key 1990 level, or a rise of 1.7 percentage points from 2006, the EIA said. Emissions from 1990 are the level that many supporters of carbon markets use as a …