Scientists, policymakers, and activists have 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.
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.