How close the world is to a catastrophic collapse of giant ocean currents is unknown, making halting global warming more critical than ever, scientists say. More here.
Warm current that has historically caused dramatic changes in climate is experiencing an unprecedented slowdown and may be less stable than thought - with potentially severe consequences. More here.
California is likely facing another year of water woes. The Sierra Nevada snowpack, which supplies up to a third of California's water, is exceptionally meager this year. Experts found around half as much snow on the mountains as they typically would in early April, when the snowpack is historically most voluminous. Story here.