Carbon Dioxide Level Changes over Earth’s History
source: http://cr4.globalspec.com/PostImages/201007/CO2EarthHistory-2_E1C9031F-97DC-19A3-A77A1B83CF07142A.gif
Carbon Dioxide Level Changes over Earth’s History
source: http://cr4.globalspec.com/PostImages/201007/CO2EarthHistory-2_E1C9031F-97DC-19A3-A77A1B83CF07142A.gif