Personally I don't feel in the least bit qualified to give an opinion on whether man kind is the cause of or even contributes to global warming and/or climate change. So I will not express one. But I've had a few experiences in life that convinces me that we should be aware of the impact of our decisions as we advance in our knowledge and capabilities, that not all of our decisions are the best. That we do in fact experience trade offs as we develop new solutions to current problems.
I grew up in Maryland, specifically in the D.C. suburbs. I can remember clearly the issues with the Potomac river and the pollution of it. As I recall there was a time when it was highly discouraged to eat any fish that you may have been lucky to catch in the river. By the time I was in college, one of the best places to catch big catfish was the Potomac and was located just outside of the city. By then it was okay to eat fish again as I recall.
I also can remember quite clearly the EPA coming into existence under Nixon if I recall correctly. The EPA went after the steel manufacturers in Maryland that were dumping sewage into the Chesapeake Bay. The fishery was decimated by that sewage and along with it the commercial fishing industry. In particular was the vast decline in oyster production. The Chesapeake has improved since then with the cleanup but it is nowhere near what it once was.
In 1996 I made a trip to Manila where the company I worked for opened up a manufacturing operation. At the time the pollution issue in Manila was the worst I'd ever seen. In spite of being in actually pretty good physical condition and much younger and along with my counterpart, and in spite of the fact we were used to living at approximately 4500 ft elevation, we were dying after a couple of runs up and down the outside basketball court. We'd play pickup games with the other employees there in Manila after work, but the air was so bad that even at sea level we just couldn't breathe.
Trash was burned openly out on the sidewalks. The rivers were so full of garbage and human waste, the stench near them would make you want to puke and I nearly did.
So yah, I think we need to consider our impact on the environment regardless of this climate issue.
On another note, don't look now, but nuclear power is making a comeback.