MathBench > Climate Change

Keeling Nails Carbon Dioxide

Past and future

How much have CO2 levels increased in the last 50 years?

  • Show me ... :
    Make sure you compare levels from the same part of the year. Rollover the graph to see the yearly peaks from 1960 and 2010 compared.

I think I have the answer: 73 ppm, or 23% above 1960 level.

What do you think peak CO2 levels will be in 2015?

  • Show me ... :
    Extend the current trend in peak CO2 levels... rollover to see a likely prediction.

I think I have the answer: About 415 ppm, or about 30% over 1960.