NEITHER PARTY IS PRO-LIFE:

Everyone knows lead is bad for you. We've known this for a very long time: In the first century BCE, the Roman architect Vitruvius warned against using lead in pipes, observing the "pallid color" of plumbers forced to work with it. We know leaded gasoline leads to premature death in the elderly, that high lead exposure can substantially reduce IQ, and that there is likely a relationship between lead exposure in children and high rates of crime later on.

Yet lead is still everywhere -- especially in poorer countries. Pure Earth, the largest nonprofit working on lead contamination internationally, recently conducted a massive survey of products in 25 low- and middle-income countries, from Peru to Nigeria to India to the Philippines, to test for lead levels in household goods. In their sample, they found high levels of lead in 52 percent of metal and 45 percent of ceramic foodware (a category including dishes, utensils, pots and pans), as well as 41 percent of house paints and 13 percent of toys.

This has major consequences. A new paper in Lancet Planetary Health, authored by economist Bjorn Larsen and Ernesto Sánchez-Triana, World Bank's global lead for pollution management, tries to quantify the scale of the lead problem globally.

The authors estimate that some 5.5 million people die prematurely due to lead exposure every year, and that the problem as a whole imposes a social cost of $6 trillion a year. That equals 6.9 percent of total world GDP.

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