feeding far-flung grids.Eventually,it is hoped,fuel cells running on hydrogen will take the place of the internal combustion engine which is available everywhere.It is a bold vision,but if it happens very slowing, or only to a limited extent,boosters argue that it will still prompt tremendous growth for firms in the business. Analysts confidently predict the clean-energy business will grow by 20%-30%a year for a decade.Jefferies,an investment bank that organized a recent conference on the industry in London,asked participants how soon solar power would become competitive with old-fashioned generation technologies:in 2014,2015 or 2020.About three-quarters of those present,one visitor happily observed,were "cheque-writers".This "megatrend",the keynote speaker advocated, "may be the biggest job and wealth-creation opportunity of the 21st century.” Such exaggeration might remind people of dotcom bubble.But clean-energy advocates insist growth is sustainable because of the likes of Mr.Schwarzenegger.The Governor is a hero in green circles because of his enthusiasm for environment regulation.He easily won reelection partly because he seized on global warming as a concern and signed into law-America's first wide-ranging scheme to cap greenhouse-gas emissions.feeding far-flung grids. Eventually, it is hoped, fuel cells running on hydrogen will take the place of the internal combustion engine which is available everywhere. It is a bold vision, but if it happens very slowing, or only to a limited extent, boosters argue that it will still prompt tremendous growth for firms in the business. Analysts confidently predict the clean-energy business will grow by 20%-30% a year for a decade. Jefferies, an investment bank that organized a recent conference on the industry in London, asked participants how soon solar power would become competitive with old-fashioned generation technologies: in 2014, 2015 or 2020. About three-quarters of those present, one visitor happily observed, were “cheque-writers”. This “megatrend”, the keynote speaker advocated, “may be the biggest job and wealth-creation opportunity of the 21st century.” Such exaggeration might remind people of dotcom bubble. But clean-energy advocates insist growth is sustainable because of the likes of Mr. Schwarzenegger. The Governor is a hero in green circles because of his enthusiasm for environment regulation. He easily won reelection partly because he seized on global warming as a concern and signed into law—America’s first wide-ranging scheme to cap greenhouse-gas emissions