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9.4 Climate Change. Global warming or climate change Greenhouse effect Impacts. Weather. Day to day temperatures Changes with the seasons. Climate. Long-term patterns of weather in a region Climate should not change much over the years. Patterns. World has warmed and cooled for years

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9.4 Climate Change


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    1. 9.4 Climate Change Global warming or climate change Greenhouse effect Impacts

    2. Weather • Day to day temperatures • Changes with the seasons

    3. Climate • Long-term patterns of weather in a region • Climate should not change much over the years

    4. Patterns • World has warmed and cooled for years • Several ice ages in the last million years • Scientists can look at ice cores in glaciers to find out what the climate was like • Or muck at the bottom of lakes • Or rings inside a tree

    5. Last 100 years • The global temperature is rising • It has increased almost 1 degree C

    6. Climate Change • Many changes are occurring besides temperature..some places experience…. • More rain • More drought • Colder temperatures • More cloud cover • Natural disasters – flooding, hurricanes

    7. Extreme Weather • Floods • Hurricanes • Droughts • Damage buildings, kill people, wildlife, destroy crops

    8. A Few Degrees • The last ice age the world was only about 4-6 degrees cooler than it is today • By 2080 winter temperatures in the Arctic could rise up to 14 degrees • Summer temperatures could increase 4-7 degrees

    9. Our Atmosphere • The sun’s energy is absorbed by land and water • Absorbed heat is slowly released into the atmosphere • The atmosphere traps the heat in, like a greenhouse

    10. Greenhouse Gases • Green house gases • Carbon dioxide, methane and nitrous oxide

    11. Greenhouse gases Carbon dioxide Nitrous oxide Methane Water Sulfur hexafluoride

    12. “Greenhouse effect” Increasing greenhouse gases trap more heat

    13. Greenhouse Effect • The rise in Earth’s average temperature over time • Due to gases that trap heat • Without these gases, heat would escape back into space and Earth’s average temperature would be about 60ºF colder.

    14. What do climate scientists really think?

    15. Human Activities That emitt green house gases • Burning fossil fuels • Fuel for vehicles-gas, diesel • Heat - propane, natural gas • Electricity – coal • Cutting down trees and plants

    16. Impacts • Crazy weather • Melting permafrost (landslides) • Break up of sea ice (homes for wildlife) • Rising sea levels (flooding of coastal cities) • Forest fires (too dry) • Southern species are moving North

    17. Carbon Sink • Absorb and store carbon • Forests, soil oceans, plants, animals

    18. Carbon Sequestration • Store excess carbon emitted by humans • Carbon sinks naturally • Plant trees • Protect forests

    19. Artificial Trees • Built to absorb carbon