Which response most accurately describes a key difference between ecological economics and classical economics? a. Classical economic theory values natural resources for their intrinsic value as well as their value to human beings b. Classical economic theory values the future as much as the present while ecological economists discount the future c. Ecological economics fails to include negative externalities in pricing schemes while classical economics incorporates those prices d. Ecological economics treats the free market economy as a subsystem of the ecosphere, while classical economic theory does the opposite