 I don't think that oil independence is possible so long as we use oil. I think what many people think of oil independence being is that we produced all of the oil that we consumed. But the fact is, we're dependent on a price that is set in the world oil market. The oil is a fungible commodity with a single price everywhere in the world with most of the differences of function of distance and the quality. And it's the volatility in that price that creates the economic insecurity, which is also the basis of our national security and foreign policy issues that are a function of our dependence on oil. We've chosen to promote a path of electrification. Electrification allows us to rely on a diverse set of fuels which are produced domestically whose price is not particularly volatile. It is more efficient than oil and has better emissions profile than oil that will continue to improve over time. We think that so long as we're using oil we're going to be dependent on it. The best path is to look for an alternative. Of course, it depends what you mean by oil independence. Does it mean that we'll never have oil imports or in our lifetimes? The answer is no, we'll always have to be importing oil until we switch entirely out of oil as a fuel. But there are of course ways we can reduce our dependence on oil, such as as an economist this won't come as any surprise but as an oil tax raising the price of oil. This operates, this tax operates on all margins. It changes behavior. People will drive less. It changes innovation incentives. People with a good idea can find ways of reducing oil use and oil intensity. And it encourages people to buy more fuel efficient vehicles.