https://techcrunch.com/2018/12/15/california-says-all-city-buses-have-to-be-emission-free-by-2040/ > On the heels of a dire government report published last month about climate change and its devastating impacts, many cities and states are scrambling to find ways to curb the greenhouse gas emissions that threaten their air quality, not to mention their economies. > As is often the case, California is leading the charge, yesterday becoming the first state to mandate that mass transit agencies purchase fully electric buses only beginning in 2029, and that public transit routes be populated by electric buses alone by 2040.