There are a lot of controversy around global warming. Find the facts from a reputable source. The documentary An Inconvenient Truth is presented by Al Gore, former Vice President of the United States. Although he did not win the 2000 presidential elections; he did win the Nobel Peace prize in 2007 for his crusade to fight global warming. He is also chairman of Alliance for Climate Protection.
After seeing this film, I thoroughly recommend it. The charts and animations and graphical presentation of the facts are amazingly well done. You will be shocked to see the before and after picture of the glaciers. It makes the dangers of global warming crystal clear without needing a scientific background.