Scientists from the Max Planck Institute for Marine Microbiology find that urea is a major energy source for ammonia-oxidizing archaea (AOA) in the open ocean, while coastal AOA prefer ammonium. The study, published in Nature Communications, suggests that organic nitrogen plays a far greater role in ocean productivity than previously recognized.

Reciprocity matters--people were more supportive of climate policies in their country if they believed other countries were making significant efforts themselves, per survey of 4,000 Chinese, Indian, Japanese and US citizens.

A UC Berkeley-led analysis of tree mortality after two recent Amazonian droughts shows that “hot drought” conditions, which are becoming more frequent, are leading to tree dieoffs and reducing the region’s ability to absorb anthropogenic carbon dioxide. Climate models show that the new, hotter, drier conditions, referred to as the “hypertropics,” are outside the parameters of normal biomes in the Amazon and more like some tropical biomes 10-40 million years ago.

University of Sydney marine biologists have identified a devastating combination of coral bleaching and a rare necrotic wasting disease that wiped out large, long-lived corals on the Great Barrier Reef during the record 2024 marine heatwave. Their findings suggest climate change is happening too quickly for corals to adjust.

New research reveals how the speed of ocean currents and the shape of the seabed influence the amount of heat flowing underneath Antarctic ice shelves, contributing to melting.

Scientists at the University of East Anglia (UEA) used an autonomous underwater vehicle to survey beneath the Dotson Ice Shelf in the Amundsen Sea, an area of rapid glacial ice loss largely due to increasing ocean heat around and below ice shelves.