The claim that there is no statistically significant evidence comes from Phil Jones, the scientist at East Anglia University who came up with the (in)famous “hockey stick graph,” purposefully stonewalled on Freedom on Information Requests, and so on. The only similar about-face I can recall is when Gorbechev came clean and said Marxism was just used for propaganda purposes.
Update: More at Geographic Travels:
The man at the center of the scandal, Dr. Phil Jones has both greatly helped damaged science. His lies and dishonesty have revealed the irrationality of the current wave of global warming alarmism which was based on secular religion and politics. However, his actions have hurt anyone currently trying to honestly figure out the current state of the global environment as Jones’ “crying wolf” has hardened the hearts of much of the public.
Dr. Jone is staring to come clean. He has said some surprising things in a recent interview with the BBC. Jones discusses many interesting things but there are some surprises coming from him. He admits that the Medieval Warm Period (the hot period around the year 1000, a time when England made wine and Greenland was green in the south) was a global warm period, that the warming trends such as 1860-1880 and 1910-1940 were similar to the recent warming period, and that there has been no statistically-significant global warming since 1995!
Developed countries can afford the cost of many environmental programs. As a society we should invest in a clean and healthy future but we must allow science to be practiced openly free from the influence of whose those who take their positions as dogma which must be defended at all cost.