That's a good question. The world is going to transition towards fossil-fuel-free vehicles. The question for us is, do we move ourselves among the leaders of that pack or are we late adopters?
There's probably a basket of things you could do to encourage that transition. Having vehicle fuel efficiency standards is part of it. It might encourage you to move your entire vehicle fleet towards lower polluting, more efficient vehicles. That's really the low-hanging fruit. We should definitely do that.
As the U.S. relaxes its standards, we should keep pace with California. As long as you're moving with a big enough part of the North American economy, the market is going to supply.