And China’s decision late last year to require that most vehicles sold there be electric by 2035 is also critical because G.M. sells more cars in that country through its joint ventures than in the United States. And Britain, Ireland and the Netherlands have said they will ban sales of new gasoline and diesel cars starting in 2030.G.M. has been talking about moving to zero-emissions vehicles for about two years. Last March, it unveiled modular battery technology that it said would lower costs. A few months later, G.M. said it could reach a point where electric vehicles …
