Although levels of DDT contamination are gradually falling in countries where
the pesticide has been banned, new scientific research suggests that the chemicals
are still a serious threat everywhere. Studies show that even small amounts of
pesticides can disrupt the working of human hormones, interfering with
reproduction and the functioning of the immune system. That’s why
representatives of more than 100 nations gathered at a U.N. meeting in Nairobi
to work toward a global treaty that would phase out DDT and 11 other
pesticides, known as the “dirty dozen.” Environmentalists say it’s possible to
find alternative way to fight malaria—and get rid of DDT once and for all.