1930-1960


 * Development:**

__Deadly smog episodes:__ London (1952, 1956), New York (1953), and Los Angeles (1954) Caused by- extreme cold and pollution

__Pollution Act__: 1955 -- Congress passes Air Pollution Control Act, a forerunner of the Clean Air Act of 1963 and subsequent legislation (First international air pollution conference is held in Los angeles) Increasing C02 buildup is one surprising conclusion of Scripps Oceanographic Institute scientists working on International Geophysical Year projects 1957.

The truth about leaded gasoline emerges dramatically in1965 Senate hearings as scientist Clair Patterson testifies about the obvious and apparently deliberate lacunae and falsehoods in lead industry research. 1949 -- First United Nations conference on the environment, the Scientific Conference on Conservation and the Utilization of Natural Resources.
 * Research:**