The Old Oligarch
has a link to an important article here .
Taking this seriously would deprive a lot of folks of the satisfaction they get disguising their lack of generosity as concern for the world. (Yes, I know, not all couples with few children or none are lacking in generosity. I'm talking about the type who go up to mothers-of-many in supermarkets and make stupid remarks. "You're so selfish!" "Don't you care about the environment ?", etc. This has happened to friends of mine. )