Even with aggressive promotion of battery-electric or hydrogen fuel-cell cars, hundreds of millions of internal-combustion vehicles will remain on the world's roads for decades to come. But estimates of exactly how many internal-combustion cars will be displaced by alternatives in a given period vary wildly. One alternative-fuels lobbying group... 3 billion cars by 2050 would need biofuels to offset climate impact: projection
Even with aggressive promotion of battery-electric or hydrogen fuel-cell cars, hundreds of millions of internal-combustion vehicles will remain on the world's roads for decades to come. But estimates of exactly how many internal-combustion cars will be displaced by alternatives in a given period vary wildly. One alternative-fuels lobbying group...