The link in the studies may be determined to be casual. However, in my opinion its worth paying attention to.

Some gems: "Stopping DDT's use did not make the chemical go away. DDT is a persistent organic pollutant, meaning that it breaks down slowly over decades, easily entering the food chain."

"It is still used to control mosquitoes and other pests in areas with particularly high rates of malaria, such as certain parts of sub-Saharan Africa."