Not necessarily. If the solar installer can't get to the customer's house because he's traveling by horse... Or the biofuel engineer spends an extra 2 hours a

Not necessarily. If the solar installer can't get to the customer's house because he's traveling by horse... Or the biofuel engineer spends an extra 2 hours a day commuting on his horse, rather than developing new technologies in his lab... Then it's not better for the environment for us to all move to horse and cart.