International

"The delicate balance of one of the planet’s largest natural systems for storing carbon depends on the humble black spruce tree."

"Federal forecasters are warning of a severe solar storm through Tuesday that potentially threatens satellites, orbital communications and some infrastructure."

"Earth’s warming could trigger sweeping changes in the natural world that would be hard, if not impossible, to reverse."

"An Australian start-up is hoping fungi can pull carbon dioxide from the air and stash it underground. It’s one of several ventures trying to deploy the superpowers of soil to slow global warming."

"The world is currently seeing the fastest-spreading, largest-ever outbreak of H5N1, a highly contagious, deadly strain of avian influenza. Scientists say this virus now presents an existential threat to the world’s biodiversity, with the risk to humans rising as it continues to leap the species barrier, reaching new host species."

"Along any busy roadway, the remnants of car exhaust hang in the air, among them nitrogen oxides and ozone. These pollutants, which are also released by many industrial facilities and power plants, float through the air for hours to years. Scientists have long known that these chemicals are harmful to human health. But now, a growing body of evidence suggests that these same pollutants also make life harder for insect pollinators and the plants that rely on them."