There are two problems that I have with this romantic view of DDT: 1. Mosquitoes become resistant to DDT over time, as is the case with most pesticides. 2. DD

There are two problems that I have with this romantic view of DDT: 1. Mosquitoes become resistant to DDT over time, as is the case with most pesticides. 2. DDT might possibly be "cost effective" when considering direct costs, When you start factoring in the indirect costs, it doesn't look so good. DDT bio-accumulates and decimated many bird species, including insectivorous birds, the last time it was used. In the intervening years, habitat and bird populations have continued to decline. The cost today, especially to ecosystem services, could be very great.