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Clean water and air are very essential to the environment. Humans are taking several initiates to reduce air and water pollution, examples may be cleaning oceans, lakes, ponds, rivers, etc. This is recovering our environment from negative impacts on humans in the past like acid rain (Fusion Book).

Charzio. Man Cleaning Lake. Frisco.

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Global warming is the term used to describe a gradual increase in the average temperature of the Earth's atmosphere and its oceans, a change that is believed to be permanently changing the Earth's climate. The greenhouse effect is the warming that happens when certain gases in Earth's atmosphere trap heat. These gases let in light but keep heat from escaping, like the glass walls of a greenhouse, hence the name. Scientists have known about the greenhouse effect since 1824 whe Joseph Fourier calculated the Earth would be much colder if it had no atmosphere. This natural greenhouse effect is what keeps the Earth's climate livable.

Richards, Cory, and Michael Melford. “What Is Global Warming?” National Geographic, National Geographic, 22 Jan. 2019, www.nationalgeographic.com/environment/global-warming/global-warming-overview/.

Aniketh. Glaciers. Los Angeles.

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In the UK major floods in an area in 2015-16 flushed more than 40bn of micro plastic into the sea. These pieces include broken down plastic waste, synthetic fibers and beads found in personal hygiene products.They're known to harm marine life which mistake them for food.Which can be consumed by humans through seafood tap water or other foods.

US Department of Commerce, and National Oceanic and Atmospheric Administration. “What Are Microplastics?” NOAA's National Ocean Service, 13 Apr. 2016, oceanservice.noaa.gov/facts/microplastics.html.

Diz, Bofa. Micro Plastics. China.

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Founded in 1970 was formed to stop threats to the environment. Environmental laws and management programs have a positive effect on the world's ecosystem when enforced.These laws are in place to keep companies from destroying ecosystems by preventing them from dumping industrial contaminants on the ground into rivers streams or other waterways.

“Environmental Protection Agency.” E | A-Z Index of U.S. Government Departments and Agencies | USAGov, USAGov, www.usa.gov/federal-agencies/environmental-protection-agency.

Bangoo. Safe Earth. Bangkok.

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An artificial reef is a man-made underwater structure, typically built to promote marine life in areas with a generally featureless bottom, to control erosion, block ship passage, block the use of trawling nets, or improve surfing. Humans also protect endangered species and cleaning lakes and seas has a positive effect on the environment (Fusion Book).

Chapo. Fish in the Water. Mexico.

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Negative effects on the internment can include deforestation over harvesting and more. Humans every year provide billions of pounds of commercial fish from the ocean. Such as tuna, cod, shellfish, crabs, and lobsters. In 1990 in metric tons there were 400 metric tons of cod but in 2010 it was roughly 20 metric tons.
Deforestation, clearing forests can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people (Fusion Book).

Kird, Werd. Tree On Ground Yeet. Poland.

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A male elephants tusks are bigger and heavier than those of a female of the same age, says Poole,¨But once there [have] been heavy poaching pressure on a population, then the poachers start to focus on the older females as well,¨ She explains.¨Over time, with the older age population, you start to get this really high proportion of tuskless females.¨

Guyton, Jen. “Elephants Are Evolving to Lose Their Tusks.” National Geographic, National Geographic, 9 Nov. 2018, www.nationalgeographic.com/animals/2018/11/wildlife-watch-news-tuskless-elephants-behavior-change/.)

Dud, Feya. Ded Elephant. India.

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Natural selection is the process whereby organisms in a population have traits that let them survive in a specific environment. Those traits may no longer be helpful when the environment changes. This happens with natural selection.
Example #1- If rainfall increases over time, the wetland where these birds live may become deeper. Birds with long legs may find food easily. Birds with short legs may not find food. More long-legged birds may survive and reproduce making the long-legged trait more common in the population.
Example #2- In a habitat there are red bugs and green bugs. The birds prefer the taste of red bugs so soon there are many green bugs and few bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs (Fusion Book).

Redako, James. Bird Evolution. New York.