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Part 5

Humans are the Primary Cause of Global Warming. Part 5. Some Reasons We Know Humans are the Main Cause.

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Part 5

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  1. Humans are the Primary Cause of Global Warming Part 5

  2. Some Reasons We Know Humans are the Main Cause • There is a good correlation between the rise in human-caused emissions of greenhouse gases, the rise in atmospheric greenhouse gases, and the rise in temperature. The rate of increase in each is unprecedented. • There is a good correlation between the growth in the human population and the rise in greenhouse gases and temperature. • Computer simulations indicate that only human-caused emissions of greenhouse gases can cause the observed rise in temperature of the atmosphere and other Earth systems (Oceans, Continents and Ice). • No other natural causes can account for the present rapid rise in temperature and CO2. The present rate of CO2 increase is about 20,000 faster than natural rates. • Carbon isotopes due to burning fossil fuels are the main constituent of the increased CO2 concentration (falling 13C to 12C ratio).

  3. Annual Growth Rate of CO2 Emissions

  4. Country CO2 Emissions for 1990, 2000 and 2010

  5. Per Capita CO2 Emissions for 1990, 2000, and 2011

  6. Coal:The Worst CO2 Emitter • One mid-sized coal-fired power plant (500-megawatts) emits about 3.5 million tons of CO2 annually. • This is equivalent to 625,000 additional cars on the road traveling 12,000 miles per year. • In the U.S. utility companies have proposed building 185 new coal-fired power plants (10 in operation, 32 under construction, and 90 in early development). • China is building, on average, 2 coal-fired power plants each week.

  7. How Right They Were!

  8. Intensity of Climate Drivers (2006)

  9. Radiative Forcing from Various Causes(Black Carbon is not included and the sunlight-reflecting potential of Aerosols may be overestimated1)

  10. Temperature, CO2 Concentrations and Human- Caused Carbon Emissions

  11. Only Human-caused Greenhouse Gas Emissions Can Account for Global Warming • The black line is the observed temperature rise. • The orange area is computer simulations of all emissions, including human. • The blue area is computer simulations of only natural emissions and the increase in solar activity.

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