On the specific topic here, of greenhouse emissions, the U.S. has been decreasing its per capita emissions for something like 15-20 years. We have a long way to go, and should be going faster, but we are making progress right now. And none of this progress was inevitable. It was specific efforts by nonprofits, by governmental entities, by private industry, and by individuals to demand lower emissions.

Past environmental successes include the elimination of acid rain, the reversal of the hole in the ozone layer, and the vast improvement in outdoor particulate pollution and smog in the past few decades. This stuff matters, we have been making a difference, and the moment we give up we will start backsliding.