Is it all the money that gets pumped into research and corps who otherwise would be unemployed since they produce nothing?
Is it dragging the first world down to agrarianism like third world with motive as fairness?
Do you believe it? Even if you do, and it's true, can we police the world? Or is it a case of - if we don't use xyz someone else will costing us immediately by not enjoying resource and long term by stagnation.
Whether the climate is changing for better or worse, no one knows. Current "climate change advocates" are after one thing, though: power. That's all. They're not interested in "saving" the planet. They're not interested in "solving" the "problem." They're after one thing only: power.
With that power, they will push their overwhelmingly liberal adjendas, such as global redistribution of wealth and a further push toward global government. Both of these are not good things.
Additionally, there are those such as Al Gore and Nancy Pelosi who stand to make billions of dollars by pushing government funding and regulation toward so-called "green" energy and "green" jobs. It's all about power and greed.
I personally believe that the climate will change regardless of any policy or behavioral changes we as humans make. Our worlds climates and tides and currents are more influenced by the natural cycles of the sun and the moon than we could ever hope achieve, and I believe we display an arrogance of the highest order by believing we could ever attempt to change such in any kind of meaningful way.
That said, there's no guarantee or proof or even hypothesis that climate change will be a net negative at all. There are many benefits that would go along with slightly higher average global temperatures, and there aren't many real negatives (reports of beachfront property in Kansas are highly exaggerated). Sure, we'd lose some species of life, but we would also see new ones pop up. Isn't Darwinism and evolution some kind of creed among liberals...you know, survival of the fittest? As far as slight warming causing massive drought, famine, war, and death...I'll believe it when I see it.