A New Surprise Benefit of Cutting Lead Pollution

Studies have shown a strong connection between the phase-out of lead in gasoline starting in the mid-1970s and a plunge in violent crime in the following decades. As Kevin Drum reports at Mother Jones, a new study is connecting lower levels of childhood lead exposure to a later drop in the teen pregnancy rate:

For years conservatives bemoaned the problem of risky and violent behavior among children and teens of the post-60s era, mostly blaming it on the breakdown of the family and a general decline in discipline. Liberals tended to take this less seriously, and in any case mostly blamed it on societal problems. In the end, though, it turned out that conservatives were right. It wasn't just a bunch of oldsters complaining about the kids these days. Crime was up, drug use was up, and teen pregnancy was up. It was a genuine phenomenon and a genuine problem.

But liberals were right that it wasn't related to the disintegration of the family or lower rates of churchgoing or any of that. After all, families didn't suddenly start getting back together in the 90s and churchgoing didn't suddenly rise. But teenage crime, drug use, and pregnancy rates all went down. And down. And down.

Most likely, there was a real problem, but it was a problem no one had a clue about. We were poisoning our children with a well-known neurotoxin, and this toxin lowered their IQs, made them into fidgety kids, wrecked their educations, and then turned them into juvenile delinquents, teen mothers, and violent criminals. When we got rid of the toxin, all of these problems magically started to decline.

Today, we're debating whether to cut the toxic heavy metal and carbon pollution from coal by shutting down the oldest, dirtiest coal-fired power plants. But the benefits aren't hidden - we know coal kills thousands of people every year and causes thousands more asthma attacks in children.

Electricity rates and jobs are obviously important, but why do reporters talk almost exclusively about those, and hardly at all about these very real impacts on our lives? When did human health become a sidebar story?

Cutting Lead Exposure Even More Beneficial to Kids Than We Thought

As fears of childhood lead poisoning swept Boston in the 1980s, The Green Miles distinctly remembers being dragged to the doctor by The Green Mom to have his blood tested for lead poisoning, despite my protestations that no kid so wicked smahht could've been impaired by lead.

Now Slate's Matt Yglesias flags new research adding to the growing mountain of evidence that those fears about lead exposure were not only justified, but understated. The research by Jessica Wolpaw Reyes published in the National Bureau of Economic Research finds cutting lead exposure has made Massachusetts children measurably smarter:

Childhood exposure to even low levels of lead can adversely affect neurodevelopment, behavior, and cognitive performance. This paper investigates the link between lead exposure and student achievement in Massachusetts. Panel data analysis is conducted at the school-cohort level for children born between 1991 and 2000 and attending 3rd and 4th grades between 2000 and 2009 at more than 1,000 public elementary schools in the state. Massachusetts is well-suited for this analysis both because it has been a leader in the reduction of childhood lead levels and also because it has mandated standardized achievement tests in public elementary schools for almost two decades. The paper finds that elevated levels of blood lead in early childhood adversely impact standardized test performance, even when controlling for community and school characteristics. The results imply that public health policy that reduced childhood lead levels in the 1990s was responsible for modest but statistically significant improvements in test performance in the 2000s, lowering the share of children scoring unsatisfactory on standardized tests by 1 to 2 percentage points. Public health policy targeting lead thus has clear potential to improve academic performance, with particular promise for children in low income communities.

When we talk about environmental regulations, the public debate centers almost entirely on cost - higher taxes, higher prices, etc. But as David Roberts has detailed, limits on lead have had massively higher benefits than anyone predicted.

It's a lesson worth remembering whenever industries or their allies scream bloody murder about efforts to limit pollutants like mercury, carbon - or even, after all these years and all this research about the massive return on investment, lead.