> although I suppose it should let you know whether you could hope to change anything by changing human activity

This is the discussion. As I understand "climate change deniers" aren't denying things like the increase global temperatures or the rising of sea level. The science is clear that these are happening. They are denying that human behavior changed or changes anything. I agree it should be a moot point whether humans caused it or not as there are other reasons to make changes but being inconvenienced is hard and spending money isn't profitable. It's a lot easier to bike shed.