• Increases in greenhouse gases (GHGs).
  • GHG increases are causing global warming
  • atmospheric changes confirm greenhouse warming
    • rising tropopause
    • stratospheric cooling
  • CO2 increases have *followed* rises in temperature
    • current warming mechanisms are different
• Increases in solar activity
  • warming and solar activity have been correlated historically
  • recent warming has continued despite reduced solar activity
• Satellite microwave transmissions
  • satellite transmissions can cause warming
  • global warming coincides with increase in satellite transmissions
  • microwave transmissions have too little energy to cause global w...
• Decreases in earth's albedo
  • albedo decline is causing global warming
• Decline in the ozone layer
  • ozone layer decline is causing global warming
• Drop in volcanic activity
  • global warming is caused by drop in volcanic activity
    • volcanic activity has been high in late 20th century
• Decline in cosmic radiation
  • reduced cosmic radiation causes global warming
• The El Nino cycle
  • oscillation does not explain long-term temperature trend