Good sex education and available birth control should prevent the problem of unwanted pregnancies in the first place, but if all else fails, abortion should be available to any woman who wants one.

That's it in a nutshell, Don. What the planet needs is a panel of wise people (vicars, bishops, right-wingers, etc., would be rigorously excluded) to define good sex education. The plumbing department is about ten percent of good sex education. Advice on family planning and contraception (useless unless contraception is freely available) is another ten percent. The rest is all about teaching respect for self and for others, for ridding ourselves of sexism and chauvinism and for showing children that the best world is one based on consideration for others and fair play. That's a process that you don't delegate to the biology teacher. It involves everybody who ever comes into contact with young people (in other words, everybody except the Pope, even physics specialists).