A first-of-its-kind inventory of post-fire water quality across the Western U.S., finds that contaminants and degradation persist for years following wildfires. 

The study challenges the idea that the climate of northern Africa dried out around 3 million years ago, a time when the earliest known hominids appear in the fossil record.

Ocean waters are getting greener at the poles and bluer toward the equator, according to an analysis of satellite data published in Science on June 19. The change reflects shifting concentrations of a green pigment called chlorophyll made by phytoplankton, photosynthetic marine organisms at the base of the ocean food chain. If the trend continues, marine food webs could be affected, with potential repercussions for global fisheries.