Q: Should we be actively engaged in protecting our environment
Q: Has mankind contributed to the degradation of our environment
Q: Are we the largest cause of Global Warming
A: Not really certain, possibly
Q: Can we do anything to halt or slow down the damage we are doing
Q: Should we
Well, what should we do vs what can we do becomes the biggest question. There are a number of things that reasonable people can agree upon that will have an impact. Everything from the individual effort to not deliberately contribute to polluting our environment to providing incentive's to corporations and governments to reduce and regulate appropriately. It does no long term good to punish business out of existence simply to appease one group or another. It does no good to exclaim that there is no such thing as global warming or to claim that humans have nothing to do with it or to say that there is nothing we can do about it.
But calling childish names of those that don't agree with you is even less helpful. Is it your goal to convince the opposition to change their mind and start seeing things from your point of view? If so, your efforts are woefully inadequate, assuming you would rather go with your heart and call people names. If you can't be bothered to make an effort to convince people to reconsider, then you should stop polluting the environment with your invective. I was once a very committed "denier" but I didn't stop researching and I deliberately avoid participating in the echo chambers that exist on both sides of the argument. Some very reasonable debate from considerate and passionate and knowledgeable people have contributed my change of position.
Yes, I believe there is enough evidence to conclude that the planet is warmer on average now than it has been in the last several hundred years. Yes, I believe that humans have contributed in exacerbating an natural process of warming that would have occurred without our involvement. We have made it worse by a measurable percentage. Yes I think there are things we should do to reduce the damage we are doing. No, I don't believe success will come from cap and trade, making carbon based fuel illegal or forcing our industry to move all their operations out of the country by draconian levels of regulation. I also am convinced that if we were to, today, stop all production of CO2 worldwide we wouldn't get back to "normal" levels for several decades. We need reasonable solutions that don't crush the life out of the lives we are trying to save.
We should be expending our efforts in trying to convince the opposition rather than shutting them down. We should be expending our efforts in researching and implementing reasonable solutions rather than lining the pockets of our "evangelists" and "prophets". I'm an example of the success that can be had by being reasonable, fair and adult in our efforts. It does work. Don't believe it, go back and read some of my previous posts.