LONDON—The number of electric vehicles on roads worldwide rose to a record high of 3.1 million in 2017, but more research, policies and incentives are needed to drive further uptake, the International Energy Agency (IEA) said.
The number of electric cars, including battery-electric, plug-in hybrid electric and fuel cell electric passenger light-duty vehicles, increased by 57 percent compared with 2016, the IEA said in a report.
