Huge sea level rises are coming – unless we act now - environment - 25 July 2007 - New Scientist James Hansen heads NASA's Goddard Institute for Space Studies in New York. A physicist and astronomer by training, he began his career studying the clouds on Venus. Since the late 1970s he has been studying and modelling the human impact on Earth's climate, and has published more than 100 papers. He entered the public spotlight in the 1980s with his outspoken testimony to congressional committees on climate change. Last year he made headlines when he spoke out against attempts by the US administration to gag climate scientists. in Public bookmarkswith changeclimatecryosphereicelevelmeltingriseseasheetswarnings