The text below will constitute the major overhead to be used in this lecture. If you want to print it, rather than copy it in class as we go through it in the lecture, feel free to do so.


The alleged greenhouse effect and global warming:

Anthropogenically raised CO2 concentrations in the atmosphere have caused and will cause absorption of energy in the atmosphere (an enhanced "greenhouse effect") leading to non-natural increases in temperatures on Earth ("global warming").

Questions: (to be answered in this lecture)

1. Do humans do things that can raise the CO2 content of the atmosphere?



CO2 production

US vs. world energy consumption




2. Has the CO2 content of the atmosphere increased?



Atmospheric CO2 concentrations through time Part 1

Atmospheric CO2 concentrations through time Part 2




3: Have humans caused the increase in the CO2 content of the atmosphere?



Timing of human CO2 production

Localized evidence of human CO2 production

Global evidence of addition of fossil-fuel CO2 to the atmosphere




4. Can gaseous CO2 absorb energy to heat the atmosphere?



Earth's incoming and outgoing radiation

CO2 vibrations and absorption of energy

Adsorption spectra of CO2, methane, ozone, nitrous oxide, water vapour, etc.




5. Can higher CO2 concentrations cause heating of the atmosphere?



Quaternary CO2 and temperature


Phanerozoic and Pleistocene CO2 and temperature




6. Has absorption of energy in the atmosphere by CO2 increased?



Satellite detection of greenhouse absorption of outgoing radiation




7. Has the earth become warmer during or since the Industrial Revolution?



Temperatures through time 1800s-1900s

Temperatures through time 1000-1900s




8. Has the increase in global temperature been a continuation of natural trends/fluctuations or the result of anthropogenic CO2?



Long-term temperature fluctuations

Extrapolations of natural temperature fluctuations before 1800

Calculations of natural and anthropgenic effects through time (colored lines) vs. observed temperatures through time (black line).




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