File(s) stored somewhere else
Please note: Linked content is NOT stored on Carnegie Mellon University and we can't guarantee its availability, quality, security or accept any liability.
Trading Sulfur Dioxide Allowances
Acid rain became the dominant environmental concern in the late 1970s. This problem resulted from a quirk in the 1970 Clean Air Act; Congress had designed a two-tiered system that imposed stringent standards on new sources, and all but ignored existing sources.