Opinion: Anyone claiming global warming is happening isn’t a scientist.
Where to start with this...
Virtually every scientist agrees that more CO2 going into the atmosphere causes some warming. I encourage you to read a lot of the content at Dr. Roy Spencer's site, he's an atmospheric physicist who's squarely in the "lukewarmer" camp (meaning there's a little warming going on but it's more or less harmless). He is of course regarded as a "climate denier" (whatever the heck that means) by the alarmists.
Here's a good introductory article:
http://www.drroyspencer.com/global-warming-101/
I hope the CO2 we've introduced into the atmosphere is enough to stave off the next Ice Age. The detrimental effects of even moderate warming would be nothing compared to the devastation an Ice Age would cause...and we're due for one in a relatively short time.
I encourage everyone to become more scientifically literate. Science is a beautiful thing, and responsible for a great many benefits of modern life.