The only folks these days saying global warming isn't true are those basing it on their own personal brief with no actual scientific evidence to back themselves up with.
As far as the scientific community is concerned, whom actually study it, 97% of them agree global warming is real. This includes scientists from both political parties, including several who used to say it wasn't real, but have since changed their minds based on the evidence.
Source:
http://climate.nasa.gov/scientific-consensus/