Will we ever stop using fossil fuels?
In recent years, proponents of clean energy have taken heart in the falling prices of solar and wind power, hoping they will drive an energy revolution. But a new study co-authored by an MIT professor suggests otherwise: Technology-driven cost reductions in fossil fuels will lead us to continue using all the oil, gas, and coal we can, unless governments pass new taxes on carbon emissions. “If we don’t adopt new policies, we’re not going to be leaving fossil fuels in the ground,” says Christopher Knittel, an energy economist at the MIT Sloan School of Management. “We need both a policy like a carbon tax and to put more R&D money into renewables.” While renewable energy has made promising gains in just the last few years — the cost of solar dropped by about two-thirds from 2009 to 2014 — new drilling and extraction techniques have made fossil fuels cheaper and markedly increased...