From the U.S. Energy Information Administration today:

Source: U.S. Energy Information Administration, Short-Term Energy Outlook (October 2014)

In the long term, energy-related carbon dioxide (CO2) emissions are driven by economic and efficiency trends and changes in the fuel mix. But weather fluctuations, which drive the level of energy use for both heating and cooling, are a very significant factor affecting year-to-year variation in fossil fuel consumption and their resulting emissions.

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Tags: CO2 (carbon dioxide) , emissions , STEO (Short-Term Energy Outlook) , weather