dr. frederica perera led the study. >> developmental delay at age 3, with cognitive deficits at age 5, and behavioral problems, including anxiety, depression, and attention, symptoms of those problems, at ages 6 to 7. >> these children also scored more than 4 points lower on standardized intelligence tests at age 5. >> [indistinct chatter] >> even a very small drop in i.q. can affect or can be predicted to affect lifetime earnings of that individual. >> you have these types of injustices occurring in rural communities, like out on indian reservations, for example. you have them occurring in suburbs that might be predominantly african american or latino. >> when you realize that some communities have, uh, have a disproportionate share of that pollution burden, then you begin to understand why we have communities that are sicker than others and why it is harder for those communities to recover. >> there is nothing more important than protecting the health of our children and generations to come. and no one's profit margin can justify harm brought to our children and to future generations. th