The greatest moral issue of our time?

A post from a few weeks ago continues to generate some discussion after Gordon asked me a question, which he has recently rephrased like this (my answer follows):

But are you then saying that if it turns out that if anthropogenically induced climate change turns out not to be as serious as first thought, or even turns out to be a furphy, the basic shape of your Christianity would remain unchanged?
Yes.

By the way, I don't think climate change is the #1 moral issue of our time; that issue remains whether we will follow Christ or anti-Christ, seek life or death, serve neighbour or self, worship God or the devil. I don't even think it is the greatest environmental problem faced by humanity, which is idolatry. Not so much idolatry of the created environment in Gaia-worship (though there are a small minority for whom this is an issue), but plain old Mammon. The Christian response to environmental degradation is not to buy a hybrid, but to repent of consumerism, the desire for comfort at the expense of others, the belief that the world is there as my supermarket and garbage bin. And then to produce fruit in keeping with repentance (and possibly to eat fruit in keeping with repentance too, but that is for another post).