Reef Fieldwork (IMAGE) Carnegie Institution for Science Caption Doing fieldwork at One Tree Island in Australia's Great Barrier Reef, a team led by Carnegie's Ken Caldeira pumps alkalinity across a reef flat to measure the effects on community calcification. Caldeira has done extensive work at One Tree Island, where he studies ocean acidification, marine biogeochemisty, and chemical oceanography, all related to reef decline and the perilous situation of the world's coral reefs today. Reefs are havens for marine biodiversity and underpin the economies of many coastal communities. But they are at risk thanks to changes in ocean chemistry due to greenhouse gas emissions, pollution, warming waters, overdevelopment, and overfishing. Credit Lester Kwiatkowski. Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.