Global challenges: climate change

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  • Global Challenges
    • What evidence can we use for climate change and how?
      • Long term (before people were around): Drilling into ice caps to see the amount of co2 found in the ice caps
      • Medium term: Tree rings. The colder the temperature the thinner the tree rings will be and the warmer the temperature the thicker the tree rings
      • Short term (now): Thermometers. Modern day temperature.
    • Natural cause of climate change.
      • Sunspots. which are dark patches that appear sometimes on the surface of the sun. They are caused by intense magnetic storms.
        • They cause climate change as when sun sport are reported they effect the length and severity of the winter. Due to long periods with little or no sun
      • Malankavitch cycle. Which is the movement of how the earth orbits the sun
        • It causes clime change becuase the earths orbit changes from being nearly circular to elliptical and the tilt of the axis changes. This changes the distance from the sun and earth causing the earth to cool.
    • Human causes of climate change
      • Fossil fuels which gasses  into the atmosphere.
        • Causes climate change as the carbon dioxide absorbs the infra- red radiation emited by the warm surface of the earth. preventing it to loose into space.
        • Carbon dioxide
        • Methane
        • Water vapour
        • Nitrous oxide
    • Difference between the Greenhouse effect and the Enhanced Greenhouse effect?
      • The Greenhouse effect warm the planet by normal gasses bounce around as the gasses get trapped. The enhanced greenhouse effect is when humans add additional gas to it.
    • Current impacts of climate change
      • Rising sea levels
        • Bangladesh
        • Thermal expansion, melting ice caps
      • Flooding
        • Sheffield
        • Warmer temperatures causing more evaporation (El Nina)
      • Drought
        • Australia
        • Increase in temperatures causing it to become dry.
      • Food shortages
        • Africa
        • Not good conditions to grow crop, unexpected weather conditions
    • Why are some areas more vulnerable to sea level rise than others?
      • Some countries are at sea level, so when the land ice melts is causes the sea level to rise and will flood the places that are at sea level.
    • What do we mean by the tipping point?
      • Irreversible climate change
    • The positive feedback mechanisms which influence the tipping point
      • Albedo effect is when ice is melting and less light surfaces so more heat is absorbed into the earth.
    • Africa case study
      • Loss of crops everywhere
        • Social and economical impact
        • Rising sea levels at coast kills crops.
      • Increased temperatures 0.5 warmer
        • Social and environmental impact
        • Due to climate change
      • Rising sea level
        • Environmental impact
        • permafrost melting the ice thermal expansion
    • Arctic case study
      • Sea ice melting
        • Environmental impact
        • Sea temperatures rising and global temperatures rising
      • Pola bears
        • Environmental impact
        • Sea ice melting which reduces the habitat and hunting ground for pola bears
      • Permafrost
        • Environmental
        • Melts release methane which is a powerful greenhouse gas
      • Trees
        • Environmental impact
        • More trees growing tundra getting smaller as more trees are taking over the ice.
      • Ice caps
        • Environmental factor
        • Increased global temperatures more ice caps melting
    • What is the difference between adaptation and mitigation
      • Mitigation means our actions we take to reduce climate change
      • Adaptation is dealing with the impacts and opportunities caused by climate change

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