Two quotes from an article I saw linked on FB recently:
"It’s no coincidence that most of those who are obsessed with population growth are post-reproductive wealthy white men: it’s about the only environmental issue for which they can’t be blamed."
"It’s time we had the guts to name the problem. It’s not sex; it’s money. It’s not the poor; it’s the rich."
As a side note, I'm always kind of surprised at how little attention is paid to reducing the amount of fuel we burn with non-essential air travel. This table from the Bureau of Transportation Services appears to show that (in 2005 at least) we burned about ten times as many gallons of gas/diesel in highway driving as we burned gallons of aviation fuel (domestically — international travel is not included). I don't know how the two compare in terms of emissions per mile of human travel, or emissions per mile per ton of cargo carried; but surely airplanes burn a not-insignificant fraction of the total. And what percentage of that goes for inessentials or luxuries, compared to the percentage of fuel burned by cars and trucks (including shipping)? You just don't hear about it much…