Week 9

• Geologists have put us in a new epoch that is defined by human change
• The atmospheric CO₂ has never gone above ~300 ppm, but it is well over 420 ppm right now.
  • Data goes back 800,000 years
• Alexander von Humboldt
• Joseph Fourier
  • Discovered the "greenhouse effect"
• Mauna Loa Observatory, Hawaii
  • Monthly Average CO₂ Concentration graph
    • This indicates that it has been increasing steadily since 1960.