Europe Opens the Tap for Clean Energy

Dozens of startups are listing their shares and finding friendly markets in the Old World

Clean Air Power, a company that has developed technology to run engines on a combination of diesel fuel and natural gas, started up in 1991 in smog-obsessed Southern California. But nowadays its headquarters resides in Oxford, England. And when the company made its stock market debut on Feb. 28, the listing turned up on the Alternative Investment Market, a London Stock Exchange subsidiary that caters to early-stage small caps.

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