I love that you have highlighted a very important fact in the whole argument. It is not just about whether or not 'global warming' is happening. The central point of the argument is something far more profound and important, though I disagree with the point about our 'stewardship'.
We are not the stewards of the earth. My belief is that we are the earth. We were borne from the earth, and we will return to the earth when we die. We belong here, as does every single organism that has ever lived, with one very important exception - we can realise it and we can celebrate it. I would like to think that every belief system and institutionalised religion on earth could respect and believe in that idea.
To disrespect the earth is to disrespect our home, our people, our family and ourselves. To respect and to celebrate it is to truly live out two of the greatest things we can do as people.