New research shows that retreat of an ice sheet in the Pacific Northwest led to many volcanic explosions and ocean areas with low oxygen that threatened the health of marine ecosystems.

The long journey of these compounds — likely originating in the United States and Eurasia — points to the near-global reach of industrial and agricultural pollution.

The warmer, more acidic waters caused by climate change influence the behavior of tiny marine organisms essential to ocean health.

A video reveals mature jellyfish under the Arctic sea ice, where they aren’t supposed to be.

Researchers studying the West Antarctic Peninsula marine ecosystem will recognize President Obama’s efforts to combat global warming by collecting climate data at an oceanographic station they named for the 44th president.

Until recently, too little data existed about the distribution of trace elements and nutrients in the oceans to provide a global picture. In 2002, a group of scientists connected with Columbia University’s Lamont-Doherty Earth Observatory set out to fill those gaps.

EcoChains: Arctic Crisis is a card game for ages 10 and up that challenges players to strategically manage the Arctic marine ecosystem as climate changes, while they learn about the potential impacts of future changes.