In October, the California Air Resources Board required that 7% to 11% of trucks weighing 8,500 pounds or more, a category that includes motor homes, be zero-emission vehicles beginning next year. This amounts to a ban on new motor home registrations in California, writes Lee Ohanian.

Stanford experts discuss last week's U.N. climate change conference’s outcome, energy-related challenges in climate negotiations, and how a potential Trump administration withdrawal from global climate talks might affect the U.S.