As Earth Day dawns Sunday, Americans should consider the relationship between environmentalists and the former mayor of the capital of Earth. From New York's City Hall, Rudolph W. Giuliani successfully confronted green zealots while advancing science and technology. Here again, Giuliani stands well right of where his detractors might expect. _The West Nile virus debuted in the Western Hemisphere in the College Point community in the New York borough of Queens in August 1999. Among 62 New York state residents who contracted West Nile encephalitis (brain swelling) that year, seven died. Rather than study the problem to death, that summer...