One is price. It simply means that they should be developed and marketed with common sense, as opposed to mandates. For example, pure electrics would make perfect sense in a community such as South Padre Island, Tex. It's a strip of a place, about six miles long and one mile wide. There is really no need for conventionally powered vehicles in a place like that.
Bicycles work fine.
Similarly, battery-powered vehicles make sense in other communities, such as large college campuses and retirement villages. Otherwise, consumers should be given the opportunity to drive hybrids. Both are low- emission vehicles, and both have a remarkable amount of pep. Also, there's this. All major car companies are developing hydrogen fuel-cell vehicles in which hydrogen is converted into electricity through an electrochemical process.