Subcategories - Ecology, Environment, Conservation
- Accident Spills Pesticide into the Sacramento River
- Activists Oppose Deployment of the MX Missile
- Adams Lobbies Congress to Preserve Kings Canyon
- Aerosol Containers Are Introduced
- African Lake Emits Toxic Gas
- The Alaska Highway Is Completed
- The Alaska Lands Act Is Passed
- Alaskan Oil Discovery Sparks Controversy
- The Alternative Motor Fuels Act Is Passed
- American Scientists Campaign Against Nuclear Testing
- The Amoco Cadiz Runs Aground
- Animal Welfare Act Regulates Use of Animals in Research
- Antarctic Survey Team Confirms Ozone Depletion
- Arab Members of OPEC Institute an Oil Embargo
- The Argo Merchant Spills Oil Off the New England Coast
- Armenian Earthquake Leads to Calls for Building Reform
- Arne Naess
- Arnold and Gottlieb Publish The Wise Use Agenda
- The Arroyo Seco Freeway Opens in Los Angeles
- Arvol Looking Horse
- Atlantic Richfield Discovers Oil at Prudhoe Bay, Alaska
- Atlantic Salmon Return to the Connecticut River
- Atomic Bombs Destroy Hiroshima and Nagasaki
- Atomic Energy Act
- The Atomic Energy Commission Is Established
- The Audubon Society Opens Its New Headquarters Building
- Automakers Introduce the Catalytic Converter
- Avalanches in the Alps Lead to Snow-Management Programs
- The Bald Eagle Is Removed from the Endangered Species List
- The Banning of DDT Signals New Environmental Awareness
- Beatrix Potter
- Berry Publishes The Unsettling of America
- Bhopal Disaster Kills and Injures Thousands
- Bison slaughter
- Bookchin Publishes Crisis in Our Cities
- Bookchin Warns of Synthetic Hazards
- Borlaug Begins Work on High-Yield Wheat
- Boulder Dam Is Completed
- The Braer Runs Aground near the Shetlands
- Brazilian President Announces Plans to Protect Rain Forests
- Brower Becomes Executive Director of the Sierra Club
- Brower Forms Friends of the Earth
- Brown Orders Medfly Spraying in California
- Bush Signs the Clean Air Act of 1990
- Callendar Connects Industry with Carbon Dioxide Increases
- Canada Bans Commercial Fishing in Lakes St. Clair and Erie
- Canada Bans the Hunting of Baby Seals
- Canada Establishes the Experimental Lakes Area
- Canadian Activists Found Greenpeace
- The Canadian National Parks Act Is Passed
