Which of the Following Would Be Part of a Technological

Which of the following would be part of a technological solution to reducing air pollution?

A) providing tax credits for commuters who ride buses that run on compressed natural gas
B) installing a carbon monoxide detector in your home
C) pricing a pollution-generating product or service such that costs associated with pollution and resource depletion are accounted for
D) allowing polluters to sell their excess pollution credits for a profit
E) installing smokestack scrubbers to keep air pollutants from being released