Observations - Since about 1870
| Observations since 1870 | • Earth’s average temperature has increased about 1.8 degrees F
• Atmospheric concentration of CO2 has increased from about 270ppm to about 400ppm
• The burning of fossil fuels by humans have emitted about ___ gigatons of CO2
• ___ gigatons of CO2 have been added to the atmosphere
• ___ gigatons of CO2 have been added to the oceans | | | Source: Bruce Parker |
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