ClimateWatch

Some of the chemicals that replaced ozone-harming CFCs are long-lived greenhouse gases. At NOAA's lab in Boulder, Colorado, chemist Steve Montzka leads the effort to monitor the concentration of CFC-substitutes and their potential impact on global warming.

We caught up recently with Remy Okazaki at NOAA’s Pacific Marine Environmental Laboratory in Seattle.

AgroClimate.org is an open-source suite of tools and resources tailored to farmers and ranchers in the southeastern United States.

Forecasters estimate the chance that El Niño will continue through the end of 2015 at greater than 80%. What's behind this confident forecast?

Exposure to ground-level ozone is associated with numerous effects on human health. It can also have harmful effects on sensitive vegetation and ecosystems.

Few things are more important to California’s water supply than the water content of the mountain snowpack at the start of the state’s warm season. In the latest round of our Climate Challenge game, experts and participants predicted the water content of the Sierra Nevada snowpack on May 1, 2015. The answer was disturbingly low.

Leaders who are helping their coastal communities adapt to sea level rise, increases in heavy precipitation and flooding need additional technical, human and financial assistance to do so, accordi

For 800,000 years before the twentieth century, carbon dioxide levels in Earth’s atmosphere never exceeded 300 parts per million. In March 2015, the monthly average went above 400 ppm for the first time.

For the first time since we began tracking carbon dioxide in the global atmosphere, the monthly global average concentration of this greenhouse gas surpassed 400 parts per million in March 2015, .