It's 50%. It's significant, as much as gas car economy improvements over a few decades. We should of course still take it, but it's not nearly enough. We need

It's 50%. It's significant, as much as gas car economy improvements over a few decades. We should of course still take it, but it's not nearly enough. We need a order of magnitude improvement to make the globally growing car use remotely sustainable. Reducing car usage can be done many ways, eg ensuring gas is taxed enough that gas-based cars don't stay in everyday use, and developing non car transport and urban structure.