Or 3. There are still people who believe that DDT is truly harmful to the environment, and they're in his constituency.

As a total side note:

From his homepage: "Fighting for Universal Health Coverage"

Unless you're in Africa, obviously...

(I do have to say, the humor of this post is obtuse, and may be mistaken by the uninformed. :-) )

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From: http://www.spiked-online.com/index.php?/site/article/2714/

One important reason Africa has suffered has to do with problems with the diffusion of technology. One of the most tragic is the impact of bans on the use of DDT, an insecticide which is particularly effective at killing mosquitoes. Western governments discouraged the use of DDT as a result of health and environmental concerns highlighted by environmentalists. ‘African governments were nudged into rejecting what was available and very effective but had a very bad environmental reputation,’ says Goklany. Such campaigns failed to properly balance environmental factors against the immense human cost of malaria. The World Health Organisation estimates there are at least 500million acute cases of malaria a year globally leading to over one million deaths. About 90 per cent of the deaths occur in Africa and young children are the main victims (2).

Goklany, who had two bouts of malaria as a child, says some people object to the white residue sometimes left by DDT when it is sprayed indoors. But in his experience this was not a concern for those threatened by the disease. ‘I don’t remember anyone complaining about the white residue. If you’ve ever had malaria you don’t complain about that because it’s a disease that, if you get it, knocks out several weeks of your life, even if you get over it eventually.’

Those who favoured the indoor spraying of DDT were vindicated in September 2006 when the World Health Organisation (WHO) once again approved the practice. After nearly 30 years of being phased out the WHO conceded the science and data justified the use of DDT (3).