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

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Some reasons we know humans are the main cause
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).



Country co 2 emissions for 1990 2000 and 2010
Country CO2 Emissions for 1990, 2000 and 2010


Per capita co 2 emissions for 1990 2000 and 2011
Per Capita CO2 Emissions for 1990, 2000, and 2011


Coal the worst co 2 emitter
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.




Part 5

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


Temperature co 2 concentrations and human caused carbon emissions
Temperature, CO2 Concentrations and Human- Caused Carbon Emissions


Only human caused greenhouse gas emissions can account for global warming
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.