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grifulvin In 2010, coal, oil, and gas supplied more than 80% of the world’s total primary energy supply???and the demand for energy is projected to increase by 2 to 3 times by 2100. The EMF27 study shows that without policies to cut greenhouse gas emissions, fossil fuels will remain the major energy source in 2100, with resulting increases in greenhouse gas emissions. But where should policymakers focus their carbon mitigation efforts? Which technologies hold the most promise?