inducing firms with effec- tive emission control systems to reduce emissions more than is re- quired, while permitting other firms greater leeway. Finally, says Co- hen, Congress should approve stronger economic incentives, such as penalties for delayed compliance.
Viruses and "Viruses and the Biological Control of In- sect Pests" by T. W. Tinsley, in BioScience Pest Control (Oct. 1977), 1401 Wilson Blvd., Arlington,
Va. 22209.
Farmers rely heavily on chemical sprays to protect field...