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| 5004525352 | Surface Mining Control and Reclamation Act 1977 | Regulates the environmental effects of coal mining in US | 0 | |
| 5004531302 | Love Canal NY 1978 | neighborhood in Niagra Falls site of a disaster that affected health of hundreds of its residents | 1 | |
| 5004549671 | Three Mile Island Nuclear Accident 1979 | Nuclear meltdown that occurred in Middletown Pennsylvania - cooling malfunction caused part of the core to melt in the #2 reactor. | 2 | |
| 5005029353 | Comprehensive Environmental response compensation and liability act or superfund (CERCLA) 1980 | Program designed to fund the cleanup of sites contaminated with hazardous substances and pollutants | 3 | |
| 5005029354 | Bhopal island 1984 | Chemical leak 45 tons of dangerous gas methyl from an insecticide plant | 4 | |
| 5005029355 | Chernobyl 1986 | A flawed reactor design that was operated with an inadequately trained personnel steam explosion and fires | 5 | |
| 5005029356 | Montreal protocol 1987 (amended 1990,1992) | On substances that deplete the ozone layer international treaty designed to protect the ozone layer | 6 | |
| 5005029357 | Exxon Valdez 1989 | Oil spill in Alaska ruptured hull of tanker Exxon Valdez spilled nearly 2 gallons of oil into body of water | 7 | |
| 5005029358 | 20th anniversary of Earth Day observed by 200 million people in 141 nations 1990 | The anniversary of the birth of the modern environmental movement in 1970 | 8 | |
| 5005029359 | Persian Gulf war to protect oil supplies in middle east 1991 | US went to war against Iraq to protect oil supplies in the middle east | 9 | |
| 5005029360 | Energy policy act 1992 | Addresses energy production in the US energy production distribution and consumption | 10 | |
| 5005029361 | World population hit 6 billion in 1999 | 11 | ||
| 5005029362 | Kyoto Protocol 1997-2006 | International treaty extends the 1992 United Nations to reduce greenhouse gas emissions | 12 | |
| 5005029363 | Hurricane Katrina 2005 | Costliest natural disaster fifth deadliest Hurricane | 13 | |
| 5005029364 | IPCC report on climate change 2007-2008 | Report on climate change desertification and global warming | 14 | |
| 5005029365 | Go for oil spill 2010 | BP operated Macondo prospect Deepwater Horizon oil spill | 15 | |
| 5005029366 | Tsunami in Japan 2011 | Earthquake off the Pacific coast of Tahoka Japan magnitude 9.0 undersea | 16 | |
| 5005029367 | World population hits 7 billion in 2011 | 17 | ||
| 5005029368 | Hurricane Sandy 2012 | Deadly and distractive second costliest hurricane in US history | 18 | |
| 5005029369 | Thomas Malthus 1798 | principle of population humans would overproduce if population size is not kept under control | 19 | |
| 5005029370 | John Muir 1838 | greatly expanded us national parks by establishing them | 20 | |
| 5005029371 | Walden By Henry David Thoreau 1854 | about men who lived in isolated woods and lived a simple life | 21 | |
| 5005029372 | Yellowstone National Park founded 1872 | park in wyoming signed into law by ulysses s grant | 22 | |
| 5005029373 | London Fog 1880 | severe pollution caused by thick layer of coal smog | 23 | |
| 5005029374 | Sierra Club founded 1892 | founded by Muir- helped establish Yosemite and fought reduction on its boundaries | 24 | |
| 5005029375 | Lacey Act founded 1900 | made it illegal to import export sell acquire or purchase fish in violation of us or indian law | 25 | |
| 5005029376 | Golden Age of conservation (Theodore Roosevelt) 1901-1909 | placed governemnt in an activist role - Newlands Act | 26 | |
| 5005029377 | First National wildlife refuge established 1903 | established by exacutive order 1st was Pelican Island National Wildlife Refugee | 27 | |
| 5005029378 | Us forest service founded and Gifford Pinchot 1905 | division of us department of agricultre - Pinchot was the first chief of the forest service | 28 | |
| 5005029379 | Aldo Leopold 1905 | established environmental ethics wrote a sand county almanac | 29 | |
| 5005029380 | US national park service founded 1912 | signed by woodrow wilson created new bureau in the department of the interior to protect 35 national parks | 30 | |
| 5005029381 | Civilian conservation corps 1933 | public work relief program (new deal) built public roads bridges, etc intended to promote conservation | 31 | |
| 5005029382 | Dustbowl 1934-1940 | period of severe dust storms that damaged ecology/ agiculture of the midwest | 32 | |
| 5005029383 | Donora Pennsylvania 1948 | wall of smog led to the death of 20 people and injured 7000 | 33 | |
| 5005029384 | Sand County almanac 1949 | nonfiction novel that promoted conservation | 34 | |
| 5005029385 | London smog 1952 | caused by use of coal killed thousands | 35 | |
| 5005029386 | Minamata Japan 1953 | 2252 died due to methyl mercury poisoning caused by pollution | 36 | |
| 5005029387 | Silent spring published by Rachel Carson 1962 | documented detrimental affectson the environment and birds | 37 | |
| 5005029388 | Wilderness act 1963 | estimated area of wilderness protected against permanent structures | 38 | |
| 5005029389 | Pollution of Lake eerie 1965-1969 | conatined high levels of phosphorus and nitrogen and contributed to eutrophication | 39 | |
| 5005029390 | population bomb 1968 | environmental books written by Dvaid Bower | 40 | |
| 5005029391 | Tragedy of the commons 1968 | every individual reaps the greatest benefit froma resource selfishly | 41 | |
| 5005029392 | Cuyahoga River fire 1969 | river so polluted it caught fire- helped passage of the clean water act | 42 | |
| 5005029393 | National environmental policy act 1969 (NEPA) | promotes advancement of environment and created the presidnets council on environmental quality | 43 | |
| 5005029394 | First Earth Day 1970 | drew attention to environment and promoted ecofriendly ideals | 44 | |
| 5005029395 | Environmental protection agency established 1970 | created to protect human health and the environment | 45 | |
| 5005029396 | Clean air act established 1970 | federal law to control air pollution on a national level | 46 | |
| 5005029397 | Clean water act 1972 | federal law governing water pollution | 47 | |
| 5005029398 | Endangered species act 1973 | provides conservation of species that are endangered and the ecosystems they depend on | 48 | |
| 5005029399 | FIFRA 1973 | federal law that established basic us system of pesticide regulation to protect the environment | 49 | |
| 5005029400 | OPEC and oil embargo 1973 | any nation supporting israel will be prohibited from buying their oil- end of era of cheap gas | 50 | |
| 5005029401 | Roland and Molina (UCI) announce that CFCs are depleting the ozone layer 1974 | discovered that CFCs convert ozone to oxygen and attack other ozone molecules | 51 | |
| 5005029402 | Safe drinking water act 1974 | fedreal law intended to ensure safe drinking water | 52 | |
| 5005029403 | Convention on international trade in endangered species 1975 | treaty to protect endangered species plants and animals | 53 | |
| 5005029404 | RCRA resource conservation and recovery act 1976 | federal law governing the disposal of solid waste and hazardous waste | 54 |
