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10,000 years ago:  Agricultural revolution 

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10,000 years ago:  Agricultural revolution 

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Walden is a book that acts as a reflection of simple living in nature. It is partly personal declaration of independence, a social experiment and kind of a manual for self - reliance.

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This act was signed in by President Abraham Lincoln and it gave citizens up to 160 acres of public land for them to live on, improve and pay a small registration fee. This played a key role in promoting westward expansion.

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1872:  Yellowstone National Park founded (1st national park)

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1872:  Yellowstone National Park founded (1st national park)

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1905:  U.S. forest Service founded + Gifford Pinchot

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1905:  U.S. forest Service founded + Gifford Pinchot

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This man was an American author, scientist, conservationist and environmentalist. He was also a professor at the University of Wisconsin, but is primarily known for his book "A Sand County Almanac" coming in at over 2 million copies sold.

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This act, signed in by Theodore Roosevelt, gave the executive branch complete authority to declare national monuments.

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1912:  U.S. National Park service founded 

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1912:  U.S. National Park service founded 

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This was the name given to an area of the Southern Plains area of the U.S. that was in a severe drought. High winds kicked up dust from the dry ground causing billowing clouds of dust to sweep over the area.

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This act set grazing districts which were areas that apportioned and regulated grazing. This was created in reaction to the dust bowl which was partly due to over grazing.

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This was a lethal fog that covered London for five days. This was caused from industrial pollution and high-pressure weather conditions. It brought the city to a stand still and killed thousands of people.

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1962:  Silent Spring published by Rachel Carson  

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1962:  Silent Spring published by Rachel Carson  

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1969:  Cuyahoga River in Cleveland, Ohio, caught fire

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1969:  Cuyahoga River in Cleveland, Ohio, caught fire

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This fire was caused by a build up of oily wastes and debris under two wooden bridges. It was said to have reached about 5 stories tall and lasted for twenty minutes before it was brought under control.

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This act allowed federal and state regulations to limit emissions from industrial and mobile sources. In the first twenty years of this act being in place more then 200,000 premature deaths have been prevented.

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1972: FIFRA (Federal Insecticide, Fungicide, and Rodenticide Control Act)

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1972: FIFRA (Federal Insecticide, Fungicide, and Rodenticide Control Act)

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This act allows the federal control of sale, distribution, and application of pesticides. This says that all pesticides distributed in the united states must be registered.

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This act was made to protect endangered species and the environment that then live in. This act creates a list of endangered species, gives then a habitat to live or recovery in and restores healthy populations so the species can be removed from the list.

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During the Arab Israeli War, Arab members of the organization of Petroleum Exporting Countries imposed an embargo on the United States. They did this because the U.S. resupplied the Israeli military.

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1976:  RCRA (Resource Conservation and Recovery Act)

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1976:  RCRA (Resource Conservation and Recovery Act)

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This act gave the EPA authority to control hazardous waste. The primary goals are to protect human health and the environment from potential hazardous waste, conserving energy, reducing waste and making sure that waste is managed properly.

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This made it illegal for anyone to discharge pollutants into the water in the united states. The purpose of this was to prevent, reduce, and eliminate pollution.

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1977:  Surface Mining Control and Reclamation Act

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1977:  Surface Mining Control and Reclamation Act

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This prohibits surface coal mining within a certain distance of any national park system. This was made to keep a balance between the environmental productivity and the Nation's Needs.

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This was a working class community with hundreds of houses and a school. They then found out it was sitting on top of 21,000 tons of toxic waste which was buried in the 1940s and 50s.

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There was a partially melt down on a nuclear reactor, but there was no detectable health effects in on plant workers or the public. This was the most serious accident in the U.S. commercial nuclear power plant operating history.

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1980: CERCLA (Comprehensive Environmental Response, Compensation & Liability Act AKA: Superfund)

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1980: CERCLA (Comprehensive Environmental Response, Compensation & Liability Act AKA: Superfund)

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This was caused due to several unacceptable, tragic incidents and unlawful practices of mismanaged toxic waste disposal. This act provides federal funds to clean up abandoned hazardous waste sites, accidents or spills.

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Over 20,000 people where choked to death due to a gas leak from a factory. Thousands of others developed severe health problems from this tragic event.

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There was a sudden surge of power during a reactor systems test that destroyed a reactor at the nuclear power station at Chernobyl, Ukraine. This resulted in massive amounts of radioactive material into the environment.

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This was put into place to stop the production and import of ozone depleting substances and reduce the concentration in the atmosphere. This was an effort to protect the earth's ozone layer.

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The oil tanker Exxon Valdez struck Bligh Reef off Alaska, spilling over 11 million gallons of crude oil this spill contaminated about 1,300 gallons of shoreline. This spill took about three years to clean up the bulk of it.

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This was an international treaty that commits state parties to reduce greenhouse gas emissions, based on scientific consensus that global warming is occurring and human made CO2 emissions are driving it.

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This was an oil spill in 2010 that took place in the Gulf of Mexico. This is considered the largest marine oil spill in history, spilling about 134 million gallons of oil had spilled into the ocean. There was 11 deaths involved with this oil spill and it took BP 85 days to stop the flow of oil coming from the well.

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2011: Fukushima Daiichi Nuclear Disaster

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2011: Fukushima Daiichi Nuclear Disaster