Driessen is a charlatan. I saw his written Congressional testimony at
http://resourcescommittee.house.gov/archives/108/testimony/2004/pauldriessen.pdf, where he talks of millions of deaths from "the malaria virus" that could have been prevented by DDT. But malaria is not caused by a virus, it is caused by a protozoan! This error in his written testimony to Congress, and his exaggerated claims show that he is a charlatan.
Currently it is legal to use DDT to fight malaria under international law, and the last time I checked, 8 countries use very small amounts of DDT sprayed on the walls of people's homes to control malaria. It is false to claim that environmentalists oppose this application of DDT. It is also false to imply that DDT is as effective now as it was in the 1960's, when mosquitos resistant to DDT were still relatively rare.
I read Paul Driessen's book (a right-wing religious leader mailed it to me). His numbers suggest that DDT is 95% effective, but he does not cite any medical or scientific literature to support his claim. In many parts of the world, DDT is useless against mosquitos because they have evolved resistance to DDT in response to overuse of DDT.
Driessen is not a former member of Greenpeace (maybe you have him confused with Patrick Moore). Driessen's bio says his degrees are in law and public relations and he formerly worked for an "energy consortium."
Driessen's claims are ridiculous and absurd. You could get a more balanced view by going to www.usaid.gov and searching for "malaria publications" or "malaria, publications, DDT."
There was a good story on DDT in last weekend's New York Times Magazine. I think that if there isn't enough money for better treatments, some countries should use DDT, but even better American should put a billion dollars a year in foreign aid for treating malaria with more effective medicines, and that would save millions of lives.
Anyways, to answer your question, I am the sort of environmentalist who conserves energy and buys windpower and recycles and I cheer on the Sierra Club and Greenpeace because they are doing the right thing. And when I hear outrageous claims I take them with a grain of salt and I search for information on important issues at the library.