The Jet Propulsion Laboratory has a very good new website on global climate change. It offers a nice summary of the relevant science in a variety of areas: key indicators, evidence, causes, effects, uncertainties, and solutions. The website is a good place to send people who are uninformed on global warming, but looking for basic information.
Sea levels are now rising about 1.3 inches a decade. This is not yet worrisome, but if current emissions trends continue and the rate of sea level rise merely continues the same relationship to global temperature rise that it has had in recent decades, then we could see a total rise of up to five feet by 2100, at which point the rate of sea level rise would exceed six inches a decade
– from gristmill.grist.org