I personally believe in climate change and that man is responsible. It doesn't really matter what I believe, though. I tend to believe the people that know what they're talking about, and even though some data has been altered, there seems to be an overwhelming consensus amongst the scientific community that climate change is real and is man made.
Here's a quick link to a wiki article. Yes, I know wiki is lame, unreliable, etc. but I like wiki because they include all of their great references. I could have linked to their references, but why bother when wiki does it already? Just a quickie post, though, an independent study found 97.4% of publishing climatologists and just under 90% of all earth scientists think significant man made global warming is occurring.
It doesn't really matter, though. You can choose to believe in climate change or not believe in it. You can choose to believe man is responsible or that it is just a natural occurring trend. The two opposing sides have different motives which is why they both try to influence your beliefs. You either believe that man is causing climate change and you will hopefully support alternative energy and reducing fossil fuels and the pollution, war, and long term climate effects that go with using fossil fuels. Or you believe that it's a hoax and you are comfortable with the status quo, continue using fossil fuels, save the tax dollars for supporting the fossil fuel supply instead of researching alternative fuels, and save the money wasted on researching this hoax.
Personally, I would like to see this country lose it's dependence on fossil fuels. I'm sure other countries feel the same way. Fossil fuels are finite and we will eventually need to find other energy sources anyway, so why not start now?