New research released Monday found that sea levels are rising at the fastest rate they have in the past 2,800 years, due to manmade global warming. A team of international scientists from universities in the United States, Europe, and Asia used sea indicators from marshes, coral atolls, and sediment drilling cores to compare the past 100 years of data with historical sea-level variations from thousands of years ago. The scientists found that until the 1880s, the fastest seas rose was about 1 to 1.5 inches per century. However, sea levels rose 5.5 inches from 1900 to 2000 and since 1993, the rate has jumped to a foot per century. In two studies published Monday, researchers said by 2100 the world’s oceans will rise between 11 to 52 inches.