6. Achieving lower pollution Suppose the Environmental Protection Agency (EPA) proposes a mandate that carbon emissions by American firms must be reduced to zero in order to combat climate change. Which of the following arguments best describes why the majority of economists would disagree with this policy? O Reducing methane emissions is desirable, but whatever levels of pollution firms decide to emit privately are already efficient. O The environment isn't worth protecting. The opportunity cost of zero pollution is much higher than its benefit. O Society would not benefit from lower air pollution