As temperatures warm across much of the globe, how often will people be threatened by extreme heat and extreme air pollution happening at the same time?

Scientists at the National Center for Atmospheric Research (NCAR) have used an ensemble of multiple climate model runs to simulate conditions along potential routes for the MOSAiC polar expedition, using today’s conditions in the “new Arctic.” The results suggest that thinner sea ice may carry the ship farther than would be expected compared to historical conditions and the sea ice around the ship may melt earlier than the 12-month goal. Of the 30 model runs analyzed in the new study, five (17%) showed melt-out in less than a year.

The American Meteorological Society has created a new national award in honor of NCAR senior scientist Warren Washington, a pioneer in the development of computer models of Earth's climate.

New research finds that irrigation can cancel out, or even reverse, the increased risk of heat extremes associated with human-caused climate change.

Reduced emissions under the Paris Agreement would minimize the loss of Antarctic sea ice, helping emperor penguins to survive.