Berne was settled in 1852 by Mennonite immigrants who came directly from Switzerland, and named the community for the capital of Switzerland. They began the chore of preparing for farming by clearing the land.
Intentions, however, were not always equal to actions. Implementation of the Clean Air Amendments was made difficult by a reluctant automobile industry and the energy crisis of the early 1970s. The 1970 act gave the auto industry a temporary way out of meeting the tougher standards.
Significant amendments to the Clean Air Act were made in 1977 and in 1990. If you're interested in reading the text of the Clean Air Act, you can download a PDF version of the Clean Air Act from the EPA website.