New York -- Robin Williams, who won Best Supporting Oscar for "Good Will Hunting", has recently slammed US President George Bush for refusing to accept global warming as a reality.

According to imdb.com, Williams is angry with Bush for not signing the Kyoto Treaty to cut harmful emissions and says Bush is in denial. He says: "There is global warming. I know our president doesn't agree. (Bush thinks) 'Global Warming. Oh just go inside for a bit'."