Scientists, policymakers, and activists been holding out hope that an increase in extreme weather events might prompt Americans to embrace policies that curb greenhouse-gas emissions. They may be waiting a long time, a new study suggests.
US President Barack Obama and his daughters, Sasha (c.), and Malia (r.), participate in the annual turkey pardoning ceremony marking the 67th presentation of the National Thanksgiving Turkey while in the White House in Washington.
Fifty years of rising crop yields has helped feed a hungry world. It also appears to have left its mark in more-intense seasonal swings in CO2 that land-based ecosystems take up, then return to the atmosphere.
For 57 hours in mid November, a squat lander with spindly legs made history as the first spacecraft to visit the nucleus of a comet – sending a wealth of information on the object to solar-system scientists back on Earth.
Marine ecologists have been witnessing mass mortality of starfish along the Northeast Pacific coast, and a team of scientists now believes they have identified the degenerative disease behind their deaths.