The structure and extent of coral reefs can now, for the first time, be monitored globally. NASA's Landsat 7 spacecraft has collected detailed images of reefs from nearly 900 locations around the world.

A trans-Atlantic voyage has helped scientists solve the long-standing puzzle of how high levels of ozone occur off the coast of Africa far from sources of air pollution. Trade wind mixing near the equator and lightning are cited as causes in new Geophysical Research Letters study.

Emergency food supplies for victims of the flooding in Southeast Asia are being planned with the help of new images from NASA's Terra spacecraft. The data were supplied by a unique global flood monitoring system at Dartmouth College.

Don't count on clouds to come to the rescue if the Earth's current climate-warming trend continues. New research finds that when air temperatures are higher, one important type of cloud tends to thin and reflect less sunlight back into space.