Jobs and the Environment: Being Careful With Numbers

The NYT had an article discussing jobs and the environment today. It told readers about research by Michael Greenstone, an economics professor at M.I.T, that found that the Clean Air Act and amendments from 1972-1987 led to a loss of 600,000-700,000 in the industries directly.

It is important to note that this is not a measure of the job loss to the economy as a whole. Money that was not spent in these industries was mostly spent elsewhere. This means that the job loss to the economy as a...