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Carbon Dioxide and Global Temperatures. 10.7 Chapter 19 (pp. 525-534). Let’s explore the “evidence” that increased concentrations of greenhouse gases is causing the Earth to become warmer. Was this caused by human activities?

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Carbon dioxide and global temperatures

Carbon Dioxide and Global Temperatures

10.7

Chapter 19 (pp. 525-534)



Ipcc 1988
IPCC (1988) concentrations of greenhouse gases is causing the Earth to become warmer.

  • Intergovernmental Panel on Climate Change

  • 3,000 scientists globally

  • What are the effects of global warming? (biodiversity, energy fluxes, economic, social)

  • What do we know?

  • What do we need to know?


Early co 2 understanding
Early CO concentrations of greenhouse gases is causing the Earth to become warmer.2 Understanding

  • If excess CO2 is present, then it will be absorbed by the oceans and vegetation

  • Two CO2 measurements several years apart is sufficient


Keeling mauna loa observatory
Keeling, Mauna Loa Observatory concentrations of greenhouse gases is causing the Earth to become warmer.

PROVED: CO2 levels are seasonal and concentration of CO2 is increasing each year


Developed nations
Developed Nations concentrations of greenhouse gases is causing the Earth to become warmer.

  • Per capita consumption of fossil fuels greatest

  • 20% of world population producing 75% of global CO2

  • That all changes in 2009


1880 to 2009 trends
1880 to 2009 Trends concentrations of greenhouse gases is causing the Earth to become warmer.

  • Global temperatures increased 0.8oC (1.4oF)

    • Of the ten warmed years, 9 occurred between 2000-2009

  • This temperature increase in not evenly distributed around the globe

  • The Northern lattitudes changed 1-4oC

    • 40% of the Northern ice cap has melted


  • Global Temperatures and Greenhouse Gas Concentrations for the Past 400,000 years

    • Changes in species composition

    • Ice core analysis


    Formaminifera the Past 400,000 years: different species prefer different water temperatures

    Air bubbles trapped in ice core samples



    Historical co 2 levels never went above 300 ppm
    Historical CO the Past 400,000 years2 levels never went above 300 ppm.


    The figure below presents historical CO the Past 400,000 years2 levels. Use the graph to determine the net change in atmospheric Carbon Dioxide concentration between 100,000 years ago and present day levels.




    Consensus of climate modeling
    Consensus of Climate Modeling but DRASTIC change as of 1800

    • Average global temperatures will increase 1.8 to 4oC (3.2-7.2oF) by 2100


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