The National Oceanic and Atmospheric Administration reported this week that the atmospheric levels of heat-trapping CO2 continue to rise, reaching nearly 385 parts per million in 2007. They blame the continued burning of fossil fuels such as coal, oil and gas. Levels of methane also rose, after a decade of relative stability.
If you wish to update the graph on p. 556 of Johnson's Human Biology, 5th ed., place a green dot at 385 ppmv for 2007 and then re-draw the green line from 2000 to 2007. The line is still curving upward, and getting steeper.
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