By DAVID R. BAKER, San Francisco Chronicle

Companies around the globe explore clean energy

SAN FRANCISCO -- The green tech revolution that promises new, clean sources of energy seems to be spreading everywhere -- including the oil-rich Middle East.An annual conference of green companies and investors in San Francisco this week illustrated the young industry's global reach.

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Despite record profits, oil companies face challenges

These should be the best of times for Big Oil.Petroleum prices have tripled in five years, and gasoline prices reached record heights last summer. International oil companies are making the kind of money most capitalists can only dream of.

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