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ENVIRONMENTAL CHALLENGES

CHAPTER 2, SECTION 4

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GLOBAL WARMING

  • GLOBAL WARMING IS AN INCREASE IN THE AVERAGE TEMPERATURE OF THE EARTH’S ATMOSPHERE.

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  • THE EARTH’S TEMPERATURES HAVE RISEN SINCE THE LATE 1800’S. (0.9° – 1.3 ° F)

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GLOBAL WARMING

  • SOME SCIENTISTS BELIEVE THIS IS PART OF THE LARGER CYCLE OF WARMING AND COOLING THAT IS PART OF THE EARTH’S HISTORY.

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  • OTHERS SUSPECT IT IS CAUSED BY HUMANS.

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GLOBAL WARMING

  • GREENHOUSE GASES INCLUDE WATER VAPOR AND CARBON DIOXIDE.

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  • BURNING FOSSIL FUELS HAS CAUSED AN INCREASE IN CARBON DIOXIDE.

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GLOBAL WARMING

  • IN THEORY, GREENHOUSE EFFECT COULD IMPACT THE WEATHER.

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  • LOWERING THE LEVELS OF GREENHOUSE GASES IS A COMPLEX, WORLDWIDE GOAL.

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GLOBAL WARMING

  • IN 1997, THE NATIONS OF THE WORLD SIGNED THE KYOTO PROTOCOL.

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DESERTIFICATION

  • THE PROCESS IN WHICH THE FARMLAND BECOMES LESS PRODUCTIVE.

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  • THE PROCESS IS HAPPENING IN MANY PARTS OF THE WORLD.

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DESERTIFICATION

  • IN DESERTIFICATION, NATURAL VEGETATION IS REMOVED OR DESTROYED.

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  • THERE ARE MANY CAUSES OF IT.

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DESERTIFICATION

  • OVERGRAZING – ALLOWING ANIMALS TO EAT AS MUCH AS THEY WANT. MORE THAN CAN GROW BACK.
  • CULTIVATION OF MARGINAL LANDS
  • DEFORESTATION

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DESERTIFICATION

  • SOLUTION IS TO DEVELOP SUSTAINABLE PRACTICES.

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  • KNOW THE SOLUTIONS ON PAGE 52!

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HOMEWORK

  • READ P. 48-52.

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  • BRING BOOKS TOMORROW

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