This article by Jo Nova looks at this important question and finds that the science supports about 4 years and not the 1,000 years claimed by some alarmist scientists.
This site is a reference point for those with a cool head for climate science, arguably the most political science ever. This site is and always will be advert free and I do not expect you to pay me. When the government and most of the media concentrate on alarmism, this site is the antidote for those who don't believe the scare stories - YOU ARE NOT ALONE! (blog started on 7/11/07)