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?
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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