ENVIRONMENT GUIDE: TIMELINE

 

 1930s: Dust Bowl
Poor agricultural methods and dry weather stirs dust and increases erosion on land in Oklahoma, New Mexico, Colorado, Texas, and Kansas.		  
1930-1950: Increased industrial cutting in US forests. More than half of the forested areas are degraded, about 0.5 million hectares of forests are lost.
1933-1940: America expands its highway system.
President Franklin D. Roosevelt's New Deal brings $1,834,000,000 of road construction to the US.
1945: The atomic bomb is used by the United States in attacks on Hiroshima and Nagasaki, Japan.
1945: DDT is introduced for agricultural use in the United States.

1953:

 New York smog incident kills between 170 and 260 people in November.