| http://www.w3.org/ns/prov#value | - Wind energy saw investment of $78.3 billion, down 13%, while the third-largest sector - energy-smart technologies such as smart grid, energy efficiency and electric vehicles - suffered a 7% drop to $18.8 billion.Biomass and waste-to-energy was the fourth-largest sector, at $9.7 billion in 2012, but this figure was 27% down over last year.
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