Implausible as it may seem, gasoline powered vehicles can be part of reducing carbon emissions. They need to be part of the solution and not brushed aside.

Take for example, Glacier National Park in northwest Montana, there is a fleet of 33 tour buses powered by gasoline engines. Each year, they transport 60,000 visitors mainly across Logan Pass---the park’s famed “Going to the Sun Highway.”

Without them, congestion would be much worse and fewer people would enjoy Glacier. The Logan Pass highway is narrow and hangs off the cliffs of high rugged mountains. It is a recipe for a nigh...