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  1. CO2 levels on Mauna Loa in May 2009 were 390.18ppm, up 1.68ppm (0.4%) from a year before.
  2. Global CO2 levels in April 2009 were 388.47ppm, up 2.14ppm (0.6%) from a year before.
  3. CO2 levels on Mauna Loa in April 2009 were 389.47ppm, up 2.29ppm (0.6%) from a year before.
  4. Global CO2 levels in March 2009 were 387.67ppm, up 1.69ppm (0.4%) from a year before.
  5. CO2 levels on Mauna Loa in March 2009 were 388.79ppm, up 2.83ppm (0.7%) from a year before.
  6. Global CO2 levels in February 2009 were 387.92ppm, up 2.30ppm (0.6%) from a year before.
  7. CO2 levels on Mauna Loa in February 2009 were 387.41ppm, up 1.69ppm (0.4%) from a year before.
  8. CO2 levels on Mauna Loa in January 2009 were 386.92ppm, up 1.50ppm (0.4%) from a year before.
  9. Global CO2 levels in December 2008 were 386.64ppm, up 2.38ppm (0.6%) from a year before.
  10. CO2 levels on Mauna Loa in December 2008 were 385.54ppm, up 1.64ppm (0.4%) from a year before.
  11. Global CO2 levels in November 2008 were 385.25ppm, up 2.03ppm (0.5%) from a year before.
  12. CO2 levels on Mauna Loa in November 2008 were 384.11ppm, up 1.73ppm (0.5%) from a year before.
  13. CO2 levels on Mauna Loa in October 2008 were 384.75ppm, up 3.60ppm (0.9%) from a year before.
  14. Global CO2 levels in September 2008 were 382.45ppm, up 1.95ppm (0.5%) from a year before.
  15. CO2 levels on Mauna Loa in September 2008 were 383.09ppm, up 2.36ppm (0.6%) from a year before.
  16. Global CO2 levels in August 2008 were 382.76ppm, up 2.64ppm (0.7%) from a year before.
  17. CO2 levels on Mauna Loa in August 2008 were 384.14ppm, up 2.29ppm (0.6%) from a year before.
  18. CO2 levels on Mauna Loa in July 2008 were 385.60ppm, up 1.25ppm (0.3%) from a year before.
  19. Global CO2 levels in June 2008 were 385.68ppm, up 2.60ppm (0.7%) from a year before.
  20. CO2 levels on Mauna Loa in June 2008 were 388.02ppm, up 2.04ppm (0.5%) from a year before.