An analysis by Greenpeace Energydesk showed that while natural gas covered 44 percent of the energy generation left by the fall of coal, it only contributed to 30 percent of the ensuing drop in carbon emissions.
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The International Energy Agency reports that the total benefits from energy efficiency upgrades equals -- and often exceeds -- the energy savings. The IEA finds that cost-effective efficiency investments have "the potential to boost cumulative economic output through 2035 by USD 18 trillion.”