California’s tougher-than-usual climate change policy might become more stringent before long. Assemblywoman Autumn Burke tells the Associate Press that she’s introducing a bill requiring that car manufacturers sell at least 15 percent zero-emissions free vehicles within a decade. Companies operating in the state already have to hit yearly emissions targets and get credits for sales, but this would require that they embrace electric orhydrogen fuel cell cars in a big way — not just one or two novelty models. And if they don’t sell enough eco-friendly cars, they’d have to either pay a fine to the state or pay rivals that meet the targets. Yes, they might inadvertently help the competition.