Suppose the environmental protection agency (epa) wants to mandate that all methane emissions must be reduced to zero in order to alleviate global warming in the united states. which of the following describes why most economists would disagree with this policy? a. reducing methane emissions is desirable, but whatever levels of pollution firms decide to emit privately are already efficient. b. society would not benefit from lower air pollution. c. the opportunity cost of zero pollution is much higher than its benefit. d. the environment isn't worth protecting.