There's no point in arguing if climate change is man-made. The vast majority of climate scientists think that it is, and while they could be wrong, their best guess is way better than anyone's on here. Anyone who thinks it's not man-made has an agenda and then finds "facts" to support it (a tremendously common type of thinking, sadly), rather than looking at all available information and drawing conclusions from them. So there's no point in arguing with them.
Now what to do about it? I tend to think if we manage to save the planet as it currently is, it will be through new technologies that clean the environment and sequester things that are harmful to it. This is far more likely than trying to get massive cultural and political changes. It's good for everyone to try to do their part, but in the end it's not terribly efficient when dirty technologies are cheaper for most of the developing world. And who is any developed nation to tell emerging countries they shouldn't use those dirty technologies, when they're the main reason the developed countries are where they are?
I walk everywhere, I don't eat meat or dairy (a MASSIVE part of anyone's carbon footprint, though environmental reasons are not at the heart of this decision for me), when I had the option in Wisconsin, I paid more to power company to supply my household's electricity from wind farms, I recycle, I try not to buy junk I don't need, etc., etc., etc.
Does all of this make a real difference? Nope.
The same can be said of those that think it is man-made.....just saying....:raspberry: