mathewthomas, 
Choose hybrid vehicles over electric and conventional ones if you actually want to be sustainable : IIT Kanpur study
Hybrid Electric Vehicles (HEV) emit the least amount of greenhouse gases overall.
https://www.businessinsider.in/sustainability/news/choose-hybrid-vehicles-over-electric-and-conventional-cars-if-you-actually-want-to-be-sustainable-iit-kanpur-study-says/articleshow/100694295.cms