Article: California clean-air czar's shift is new boost for diesel engines: powerful regulator sees them as an alternative for cars in global warming fight. (Industry News).(Alan Lloyd )

For years, Alan Lloyd has regarded diesel as a dirty word, synonymous with brown haze and cancer-causing black soot. It's a view he has shared with environmental activists across the U.S.

But in a striking change of heart that could alter the kinds of cars and trucks Americans drive, the chairman of the powerful California Air Resources Board is taking a new look at diesel vehicles. He thinks they're poised to emerge as part of the solution to a different environmental problem that's gaining more attention in the U.S.: global warming.

Coming from the head of California's famously pugnacious clean-air agency, that amounts to environmental apostasy. In the ...

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