The Transportation Revolution Is Not Here … Yet
Biofuel programs seek to reduce carbon emissions and certain criteria air pollutants, but they also serve to support the continued use of internal combustion engines. Greenhouse gas reduction and fuel economy programs similarly target overall reduced emissions, but do not in themselves change how consumers move from point A to point B. Bans and limitations on internal combustion engines and zero emissions vehicles programs do much more to change the nature of transportation, but do not supplant the number of vehicles on the road.
Each holds forth the promise of cleaner air from reduced emissions, but when might they actually have a realistic and measurable impact and what other changes might be required to achieve the other global objectives?