Don't Forget About Global Warming

The greenhouse gases that cause global warming are still rising (no pun intended).

The greenhouse gases widely blamed for raising the planet's temperature are still building up in the atmosphere.

The National Oceanic and Atmospheric Administration [NOAA] said Monday there was a continuing increase in carbon dioxide and nitrous oxide in the air last year, though methane leveled off.

The agency said and there was a decline in two chlorofluorocarbons, gases blamed for the ozone hole over the Antarctic.

Overall, NOAA said, its annual greenhouse gas index "shows a continuing, steady rise in the amount of heat-trapping gases in the atmosphere."