Companies participating in the European trade in emission certificates reduced by an estimated one-fifth their carbon dioxide emissions between 2007 and 2010, according to a study by the Kiel Institute for the World Economy released April 24. Companies surveyed were able to cut back on their carbon dioxide emissions by advancing energy efficiency and limiting the consumption of natural gas and petroleum products, according to the study, "The Impact of Carbon Trading on Industry: Evidence from German Manufacturing Firms."
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