With oil prices at six-year lows, now is a tempting time for consumers to buy a bigger car, fill it up with cheaper gas and hit the road. The smarter move is to use this moment to accelerate the shift to renewable energy. While increased U.S. oil production has delivered short-term economic benefits, our ongoing dependence on oil is still creating serious risks to business investment, national security and the environment. Given the inherent unpredictability…