The ice ages were due to the so-called Milankovitch cycles, that is a combination of the Earths eccentricity (the difference in distance to the sun throughout the year), the tilt of the Earth relative to the Earth-sun plane (difference summer – winter) and the time of the year when the Earth is closest to the sun.
The Nigard valley. The picture shows the retreat of the glacier. Photo: Bjørn Wold, NVE.
Changes in sea-ice thickness in the Arctic United Nations Environment Programme (UNEP) –Grid Arendal Overall change -1.3 m (40%) Positions with comparison USS Archerfish Measurements ’60s and ’90s
Hurricane Hugo http://www.photolib.noaa.gov/historic/nws/hugo1.html Digitized Charleston WSR-57 radar image of Hugo with superimposed winds Real-time winds measured onboard NOAA research aircraft flying into Hugo Wind velocity transmitted to NHC through a satellite link as eyewall hit coast Sustained winds of 155 mph at 10,000 feet and 135 mph at surface Higher gusts were estimated in area of landfall Image ID: wea00455, Historic NWS Collection Photographer: Dr. Frank Marks, AOML Hurricane Research Division
Hurricane Andrew http://www.photolib.noaa.gov/historic/nws/andy1.html Hurricane Andrew - visible satellite image taken by METEOSAT 3 This picture depicts Andrew during period of maximum intensity over Bahamas August 23,1992 Image ID: wea00520, Historic NWS Collection
Loss of Wetlands An ambitious $14 billion plan known as Coast 2050 attempts to protect more than 10,000 square kilometers of Louisiana's wetlands, which are disappearing at a rate of up to 90 square kilometers per year, one of the highest rates of land loss in the world. But a number of unanswered scientific questions swirl around the plan. And it could run afoul of powerful interests in the shipping, petroleum, and fishing industries. Louisiana's Vanishing Wetlands: Going, Going ... Joel Bourne Science 2000 290: 456. (in Letters) [Full Text]