SOME are calling it a clean energy rush. The value of new investment in sustainable energy reached $148.4 billion in 2007, an increase of 60% from the year before. Investments have grown at around the same rate or higher since 2004, according to a study from the United Nations and New Energy Finance, a research firm. Those sums include investments by private-equity and venture-capital firms, money raised through stock offerings, corporate and government money for research and development, and investments in small-scale projects or companies building new renewable energy capacity. Wind-energy projects proved most popular with new investment of over $50 billion in 2007, followed by solar and biofuel.
http://www.economist.com/research/articlesBySubject/displaystory.cfm?subjectid=8780295&story_id=11877310
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