another 44 to 67 percent. An alternative is to require industrial smokestack "scrubbers" to remove sulfur oxides in existing plants (fed- eral law already mandates them for big new ones). But a single scrub- ber can cost $200 million. A reduction of eight million tons in annual sulfur oxide emissions would cost $40 billion 1995.
Krohe doubts that scientists or politicians will be able to agree on what to do about acid rain any time soon. In the meantime, low-cost re- ductions of acid...