An argument I've seen against global warming:
Because they've changed the name a lot (global warming, climate change, and others), it's just like Creationism/Intelligent Design.
Not the most convincing of arguments, really. Kinda comes off as desperate.
But something that has always bothered me about the conspiracy side of global warming denialism is regarding the fudging/destruction of data by governments.
If this is true, why haven't governments done this very same thing to things like: the vast increase in standard of living during the 20 year period after the Civil War?
Or the 1920 Great Depression? They've had much more opportunity and far greater reason to do so, so why haven't they?
And since they haven't done it for things like that, why would they do it on something like Global Warming?