San Francisco Chronicle: In drug treatment, it’s called harm reduction – any public health program that addresses a problem incrementally, pragmatically, rather than full-on attempts to eliminate it. Controversial Danish statistician Bjørn Lomborg never uses the term in “Cool It,” his counterintuitive chalk talk on global warming, but that’s what he’s promoting – right down to the rants against NIMBYism and the heroin-and-methadone analogy for oil addiction. He’s big on cost-benefit analyses, and he wants to persuade a world…