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Nature 448, 401 (26 July 2007) | doi:10.1038/448401b; Published online 25 July 2007
Market watch
Quirin Schiermeier
The price of carbon allowances for the second phase of the European Union's emissions trading scheme, which runs from 2008 to 2012, has fallen to less than 
20 from a late-May peak of 25.Under the scheme, emissions trading credits are bought and sold — mainly by energy utilities — at five carbon exchanges, including the European Energy Exchange (EEX) in Leipzig, Germany.
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