If pollution from fertilizer run-off from farms is a bad outcome with negative externalities, then explain the economic rationale that supports an "optimal" amount of pollution from fertilizer run-off that is a quantity greater than zero.(5 points)

5 b) Farmers can adopt field and land management practices that enhance the amount of carbon captured from the atmosphere (i.e., carbon sequestration), and by doing so, farmers make positive externality for society in general (less carbon in the atmosphere means fewer greenhouse gases contributing to global climate change). Why aren't more farmers adopting these practices?(