
Enforcing the Clean Air Act of 1970
The act calls for the substantial reduction of pollutants by 1975. Its provisions are now the subject of many adversary proceedings. In the long run a new kind of cost-benefit analysis may be needed

Enforcing the Clean Air Act of 1970
The act calls for the substantial reduction of pollutants by 1975. Its provisions are now the subject of many adversary proceedings. In the long run a new kind of cost-benefit analysis may be needed

Liquid Natural Gas
Natural gas is now the fuel most commonly used in the U.S., but under certain circumstances it is uneconomical to transport and store. This drawback is being overcome by transporting and storing it as a liquid

Tar Sands and Oil Shales
The world's largest potential liquid-hydrocarbon reserves are not recoverable by ordinary oil-producing methods. The pace of their exploitation depends on technical, economic and political factors

The Secondary Recovery of Petroleum
The life of an oil well can be extended by techniques that push oil out of the rock after the decline of natural pressure. Such methods may account for half of the U.S. output of oil by 1980