The vehicle exhaust accounts for a quarter of global greenhouse gas emissions. This pollution is damaging to nearly every organ in our bodies and wreaking havoc on our climate. Transitioning to electric vehicles is critical to reach net zero emissions by 2050 and to avoid dangerous climate change impacts. So how can countries kick start this transition? First, they should mandate the production of zero emission vehicles. When combined with strong fuel economy standards and consumer incentives, policies that require automakers to sell zero emission vehicles can accelerate their adoption. In California and China, these policies have boosted EV sales. In California's legislation has already spread to 10 other states in the District of Columbia, representing more than 30% of the U.S. auto market. Second, governments must integrate EVs with other green modes of transportation, such as putting charging stations near trains and bike-share stations, and switching to electric buses will promote green mobility while reducing traffic. And third, governments must make sure that EVs are actually powered by renewable energy. Even if the vehicles themselves don't have emissions, producing the electricity that charges them does if powered by fossil fuels like coal or natural gas. So we need policies that prioritize renewables. In 2020, countries must step up their national climate commitments, transitioning to electric vehicles as a key opportunity to do so.