Emissions tied to global warming are on the rise

The United States emitted nearly 1 percent more greenhouse gases in 2005 than it did in 2004, according to an emissions inventory from the Environmental Protection Agency. From 1990 to 2005, the country’s greenhouse-gas emissions rose 16.3 percent.

The leading greenhouse gases released in the United States are carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride.