Ecological Society of America was founded
Charles Elton makes the concept of food chains and webs.
Aldo Leopold writes Game Management, beginning the discipline of wildlife management.
Dust Bowl crisis refocuses ecology on practical land usage practices.
Ruth Patrick studied interdependence of organisms, particularly fresh water ecosystems. She developed methods to measure the health of a stream.
Nature Conservancy is founded.
Acid rain effects on lakes is discovered and studied by Harold Harvey.
Air pollution reduced in cities as unleaded gas and catalytic converters are used in autos.
Scientist discover hole in ozone over Antarctica.
Water pollution seriously reduced due to new sewage treatment practices.