Ed Darrell points to a WUWT post by Indur Goklany which promotes the use of DDT to fight malaria instead of more effective measures. As with most of the DDT promoters, Goklany carefully avoids mentioning the way mosquitoes evolve resistance to insecticides. For example, here’s what he has on Sri Lanka:
For instance, malaria incidences in Sri Lanka (Ceylon) dropped from 2.8 million in the 1940s to less than 20 in 1963 (WHO 1999a, Whelan 1992). DDT spraying was stopped in 1964, and by 1969 the number of cases had grown to 2.5 million.
Now compare this with what really happened in Sri Lanka:
With widespread resistance of A. culicifacies to DDT, malathion spraying was introduced in 1975 in areas of P.falciparum transmission affording protection to nearly one million people. Towards the end of 1976 DDT spraying was completely discontinued and during 1977 exclusively malathion was used as an adulticide.
Note that the scale for malaria cases is logarithmic, so there was a factor of ten reduction in the number of cases in a few years after DDT spraying was discontinued.
The misinformation about DDT and malaria that Goklany spreads is harmful and could kill people. DDT still has a place in the fight against malaria (because of insecticide resistance we need as many different insecticides as possible), but there are more effective means available, and by trying to undercut the use of the best methods for fighting malaria, Goklany will be responsible for people dying from malaria.