Answer:
Its use is now limited to tropical regions, where it helps control malaria.
Explanation:
Dichlorodiphenyltrichloroethane (DDT) is a colorless, tasteless, and almost odorless chemical compound originally developed as an insecticide to combat malaria, typhus, and the other insect-borne human diseases. However, in the 1970s it became infamous for its environmental impacts and was banned in many countries. Other insecticides did not prove to be as effective as DDT when it came to malaria prevention, though. That's why it is still used today in tropical regions as the best way to combat malaria.
