A decade ago when electric vehicles first appeared on Colorado car lots, buyers typically were green, the environmentalist hue, motivated to save children and other living things. Auto dealer Sean Tynan recalled a couple in their 50s, professors, inspecting a Nissan Leaf 31 times over two months. They measured it, even laid under it — peering up pensively to verify it wouldn’t pollute — before converting, Tynan said. “I’ve never had another customer who came in and looked at a vehicle more than five times,” he said. Shifting out of a gas-powered car to an electric vehicle — or EV — was then, as now, the most consequential action a person could take to combat climate warming, because car exhaust from burning fossil fuels is the biggest source of heat-trapping pollution that throws the planet’s thermostat haywire. A mass shift hasn’t happened fast enough to stop intensifying megafires, heat waves, droughts and melting Arctic ice.