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What ecological issues have resulted from human impact on the Earth?

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How much land to we have to produce our food?

  • 3/4 - Oceans of the world
  • 1/8 - Inhospitable to people
        • (polar areas, deserts, swamps, very high or rocky mountains, etc)
  • Last 1/8 - Where people can live
  • 3/32 - Areas too wet, too rocky, too cold, too steep, or with too poor soil to produce food
  • 1/32 - Peel….Surface of Earth (topsoil)
        • Less than 5’ deep

Due to erosion and over-farming, we lose 25 billion tons of it per year. It takes 100 years for one inch of topsoil to form!

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ACID RAIN

  • Industries put off sulfur dioxide or nitrous oxides into the atmosphere.
  • These combine with H2O….

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to create sulfuric acid or nitric acid!

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ACID RAIN

  • Tears apart limestone buildings, monuments and statues…..
  • Limestone and marble contain calcium carbonate and when mixed with acid rain becomes……gypsum
  • Gypsum dissolves in H2O

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ACID RAIN

  • Gets into water and soil….
  • Plants and animals die!

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