What is the motivation for arguing against global warming aka climate change?

I often see or hear people arguing against climate change as I go about my day. I see it coming in two shades, those who think its not real, and those who think man is not the cause.

This is not a debate on if it is real or not, what im trying to find out, is what is the motivation, what is the point of arguing against it. what is there to be gained.

If we look at it from the perspective of those who accept it is real, but say man is not causing it. then surely we still have to do something as we will be affected by it.

If we look at it from the perspective of those who think its not real, then surely it is wise to do something anyway. maybe someone would argue that it costs money, but surely a little money is no big loss compared to the loss we will experience if it is real. with all the scientists (the ones who dont work for big oil) saying that it is real, surely there can be no evidence to suggest it is not real, and if there is, i would really like to see it as i have not seen any so far.

What could be a persons motivation for denying that climate change is real? even say big oil companies, if its about money, surely they want to be alive long enough to enjoy the money.

I just cant understand what a persons agenda or motivation could be for arguing that its not real.

any insight on the matter?