Which of the Following Environmental Problems Would Be Best Addressed

Multiple Choice

Which of the following environmental problems would be best addressed through the use of direct controls?

A) emissions from coal-fired electric generating stations that cause acid rain
B) emissions from ocean-going cruise ships
C) sulfur dioxide discharged from pulp and paper mills
D) the greenhouse gas emissions associated with residential home heating
E) a chemical additive in animal feed that pollutes groundwater and is toxic to humans