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Good to see the bald eagle is resurgent ("Baldly Back," April 30), but a cost-benefit analysis of the bird's recovery is in order. As John J. Miller reported, there were 417 nesting pairs in the lower 48 states in 1963. Since the ban on DDT, that number has swelled to 9,000 pairs. But DDT effectively controlled the Anopheles mosquito that carries the malaria parasite, reducing the number of cases to near zero. The ban, and our attendant unwillingness to use DDT in the developing world, has allowed the scourge to worsen. Some 350-500 million cases occur worldwide each year, and more than a million die from the disease, primarily children in sub-Saharan Africa. This is brutal ...