Helped in part by government stimulus funding, the world spent $63.5 billion on wind farms and turbines last year, up 23.5 percent from 2008. The global biofuel market rose 29 percent, hitting $44.9 billion, according to the annual Clean Energy Trends report from the Clean Edge Inc. research firm.
Only solar companies saw their revenue decline in 2009, and that was due to a plunge in the price of solar panels. Worldwide revenue for photovoltaic companies fell 20.3 percent last to reach $30.7 billion, the first drop since Clean Edge began tracking solar sales in 2000
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