As a bunch of men on Capitol Hill discussed whether federally supported health-care programs should have to cover contraceptive services in the United States, a new study in the medical journal the Lancet was reporting that, globally, about one in five pregnancies worldwide ends in abortion. That's a disturbingly high statistic -- whichever side of the abortion rights debate you fall. But the awkward fact for those opposed to both abortion rights and supplying contraceptives is that global evidence suggests the most foolproof way to reduce the abortion rate is, in fact, to provide more widespread access to contraceptives.

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The good news is that, according to U.N. data, the percentage of couples worldwide ages 15 to 49 using a modern method of contraception expanded from 41 percent in 1980 to 56 percent in 2009. The gray lining on that silver cloud, however, is that the rate of progress slowed considerably in the new millennium, to an annual growth rate of just 0.1 percent.

Of course, some of the 44 percent of couples who aren't using modern contraceptives are trying to have a baby. But hundreds of millions of women aren't using modern contraception because they don't have access to it or can't afford it. There are traditional, "free" methods of contraception -- the rhythm method or withdrawal, for example. But, beyond being considerably less reliable, they require the cooperation of male partners. A recent 10-country study by the World Health Organization suggests that between one in 10 and one-half of women in a relationship had suffered sexual abuse by their partners. And cross-country evidence in developing countries suggests men usually want more children than do their partners. Thus, it's naive in the extreme to assume women can always rely on their partner to cooperate in using traditional methods when it comes to avoiding pregnancy.

That's one reason why four-fifths of unintended pregnancies in the developing world occur among mothers who lack access to modern contraception, according to the Guttmacher Institute. And getting pregnant when you don't want to isn't just an inconvenience -- it can be a considerable physical danger in and of itself. Roughly 300,000 women worldwide die each year as a result of pregnancy and childbirth, with about 13 percent of those deaths due to unsafe abortions.

If you are a poor woman in a country where abortion is illegal, the options for dealing with an unwanted pregnancy are particularly grim. Take, for example, migrant Burmese women living on the Thai border. Attempts to end pregnancy usually start with self-medication; local remedies include a mix of redwood, black pepper, nutmeg, cloves, and sandalwood. When that doesn't work, the two most common approaches are a pummeling vigorous enough to pull off the placenta and cause uterine rupture or "stick abortions" -- which consists of putting a 4-inch twig into the uterus and leaving it there for days at a time. An illegal induced abortion, while considerably safer, costs about 10 times as much as these treatments. So it is perhaps not surprising that about half of pregnancy-related deaths in the region are due to botched abortions, the great majority of which are dangerous traditional approaches.

The Thai case illustrates another point -- make abortions illegal, and you just drive them underground, where they are more likely to be dangerous. In the United States, the number of abortion-related deaths per million live births fell by three-quarters between 1970 -- three years before Roe v. Wade -- and 1976. And after South Africa liberalized its abortion laws in 1997, abortion-related deaths fell dramatically. For those who fear that -- like drugs, say -- legalization would create a rampant culture wherein every woman would flock to her local clinic for an abortion on a whim, fear not: Abortion rates are actually a little higher in regions where the procedure is illegal than where abortion laws are comparatively liberal, according to the Lancet study.

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