An excellent article by George Monbiot in today's Guardian:
Face facts, Cardinal. Our awful rate of abortion is partly your responsibility
Can be found here:
http://www.guardian.co.uk/commentisfree/20
08/feb/26/health.religion
Essentially, the argument goes that those who impede access to birth control are to blame for unwanted pregnancies and hence abortions.
Sample paragraph: "A paper published by the British Medical Journal assessed four programmes seeking to persuade teenagers in the UK to abstain from sex. It found that they "were associated with an increase in the number of pregnancies among partners of young male participants". This shouldn't be surprising. Teenagers will have sex whatever grown-ups say, and the least familiar with contraception are the most likely to become pregnant. The more effectively religious leaders and conservative papers anathemise contraception, sex education and premarital sex, the higher abortion rates will go."