Problem with 'Global Warming' is that it's a big, complex issue and there's too many scientists with axes to grind.
Mix in Govermnments with agendas and you get a total mess.
Much of the data is ambiguous, at least where the overall effects are concerned: there's been far higher global temperatures in the past, and far lower ones. 15,000 years ago most of the country was under several kilometers of ice.
Personally I blame the East Europeans coming over here and stealing our jobs.
Either that or it's a Muslim plot.