Analysis of mooring observations and hydrographic data suggest the Atlantic Meridional Overturning Circulation deep water limb in the North Atlantic has weakened. Two decades of continual observations provide a greater understanding of the Earth's climate regulating system.
The Cascade Volcanic Arc stretches from Northern California to southern British Columbia and contains more than a dozen volcanoes. The U.S. Geological Survey classifies 11 of them, including Mount Baker and Mount Hood, as "very high threat," meaning they pose significant hazards to people and infrastructure.
Surface ice in Greenland has been melting at an increasing rate in recent decades, while the trend in Antarctica has moved in the opposite direction, according to researchers at the University of California, Irvine and Utrecht University in the Netherlands.
Antarctic ice shelves incurred significant ice loss between 1997 and 2001. Click to read more. Antarctica is a vast icy continent containing massive chunks of ice because of a prehistoric glaciation, which scientists predict to have taken place approximately 35 million years ago.