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Human Impacts on the Environment and the 3Rs<br />7SCIENCE: Mon. Feb. 21<br />
Review: We have learned some ways that humans make an impact on the environment<br />Population growth<br />Pollution:<br ...
Farming and Grazing<br />Land is as important to people as clean air andwater:<br />Farming (agriculture)<br />Land is use...
Deforestation<br />Some land is used as a source of wood<br />Deforestation:<br />Trees are cut down for paper, fuel, or a...
		  Landfills<br />Land is also used for storing wastes from humans<br />Landfill<br />Area where waste is deposited<br />...
Natural Preserves<br />A natural preserve is land that is not used by humans to produce something or to store waste<br />E...
Introduction to the 3Rs <br />The 3Rs represent the ideas to:<br />Recycle<br />Reduce<br />Reuse<br />These 3 ideas can h...
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Human impacts on the environment and the 3 rs

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Human impacts on the environment and the 3 rs

  1. 1. Human Impacts on the Environment and the 3Rs<br />7SCIENCE: Mon. Feb. 21<br />
  2. 2. Review: We have learned some ways that humans make an impact on the environment<br />Population growth<br />Pollution:<br />Air pollution<br />Water pollution<br />Today we will learn a few more effects humans have on the environment:<br />Farming and grazing<br />Deforestation<br />Landfills<br />Natural preserves<br />
  3. 3. Farming and Grazing<br />Land is as important to people as clean air andwater:<br />Farming (agriculture)<br />Land is used to produce food for humans<br />Chemicals such as pesticides, herbicides andfertilizers are used to increase productivity<br />Grazing <br />Land is also used to raise animals for human consumption (e.g. cows = milk, meat)<br />Usually land that cannot be used for farming<br />
  4. 4. Deforestation<br />Some land is used as a source of wood<br />Deforestation:<br />Trees are cut down for paper, fuel, or as a building material<br />Trees SHOULD BE replanted, however many forests in tropical regions are not being replaced<br />Some studies suggest that up to 50 000 species could become extinct because they are losing their habitat (forest)<br />
  5. 5. Landfills<br />Land is also used for storing wastes from humans<br />Landfill<br />Area where waste is deposited<br />Sanitary landfill is covered with dirt and this prevents waste from blowing away and reduces the odor (smell)<br />These landfills are lined with materials to prevent liquid waste from going into the water and soil<br />
  6. 6. Natural Preserves<br />A natural preserve is land that is not used by humans to produce something or to store waste<br />E.g. forests, national parks i.e. ParqueTayrona<br />Land in its natural state is decreasing as human population increases <br />WHY?<br />
  7. 7. Introduction to the 3Rs <br />The 3Rs represent the ideas to:<br />Recycle<br />Reduce<br />Reuse<br />These 3 ideas can help to decrease the human impact on the environment <br />How? Think of ways that the 3Rs can be applied to a human impact we learned about today in class<br />

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