The real hoaxer is Sen. James Inhofe, R-Okla who has been pushing his views for decades that there is no climate change. He is not above distorting data to prove his point; for example showing only the worst case scenario of NASA scientist James Hansen rather than best, likely, and worst. Since the worst case wasn't happening, Inhofe claimed that Hansen must be wrong.
I did a search on Hansen, NASA, climatologist, inhofe and found dozens of screeds against the existence of climate change. Many of these seem to pick on the tiniest shred of information to support their contention that scientists are wrong about global climate change.
Hm, thirty years ago it seemed that every January in the Twin Cities there would a week of temperatures of 20-30 below zero Fahrenheit. That's about 45 degrees latitude. In the last few years in Duluth at 47 degrees there have been few days with all day temperatures that low.
I remember skiing on March 30, 1968 on decent snow at Buck Hill, south of the Twin Cities. For the last few years Spirit Mt. in Duluth has closed by the end of March. This year Spirit Mt. closed by March 19!
The hardest people to argue with are those who sow discord with misinformation. It is a real-life Whack-a-mole situation. Two scientists with the Union of Concerned Scientists attempted to do so in "The Climate Change Hoax", Andrew J. Gunther and James J. McCarthy, Kansas City Star, 2012-03-21. Among other things they point out is "Does this 'hoax' date back to 1896, when Nobel Laureate Svante Arrhenius presented his findings that human activities releasing carbon dioxide to the atmosphere could change Earth's climate?"
See also "Mission Impossible: Global Warming Debunking Debunking", Melvyn D. Magree, Reader Weekly, 2008-03-13.