So keen were many energy and clean-technology executives to see a robust agreement to cut emissions of greenhouse gases emerge from December's climate summit that thousands of them trekked to Copenhagen to cheer policymakers on. It was to no avail: the participants failed to agree on a global mechanism to put a price on emissions, making it harder for energy firms to justify big investments in unpro-ven green technologies, such as advanced biofuels or carbon capture and storage.
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