In the developed world, legal restrictions did not stop abortion but just meant it was "exported", with Irish women for instance simply travelling to Europe, according to Guttmacher's director, Dr Sharon Camp. In the developing world, it meant lives were put at risk.

"Too many women are maimed or killed each year because they lack legal abortion access," she said.

"The gains we've seen are modest in relation to what we can achieve. Investing in family planning is essential - far too many women lack access to contraception, putting them at risk."
Josephine Quintavalle of the pro-life Comment on Reproductive Ethics said stopping women falling pregnant in the first place was an area where minds could meet.

"Abortion - back street or front street - is not the answer. Ensuring women have the means to end their pregnancies is not liberating them - they should be able to make real choices before they fall pregnant in the first place," she said.

"But that shouldn't necessarily mean taking pills everyday. There will always be problems with access and cost, particularly in countries where people struggle just to buy food.

"What we need is to better understand our fertility - if there are just 24 fertile hours in a month, we need to work out a cheap, effective way for women to know when they can fall pregnant. That would be freedom, and that's what we should aim for."