Thanks to C. Boyden Gray [“Airing out differences in EPA rulings,” letters, Feb. 26] for clarifying two Supreme Court decisions on the role of the Environmental Protection Agency in regulating greenhouse gases. Given the piecemeal approach that the United States has taken in addressing excessive greenhouse gas emissions, why not minimize regulatory attempts and use the more effective approach of a carbon fee? Let’s tax the activities that we clearly want to find alternatives for, and let the free market find healthier ways for us to live in the 21st century.

Sabrina S. Fu, Ellicott City