Question:

What is the trend in atmospheric CO2 seasonally and over the past 50 years?

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What is the trend in atmospheric CO2 seasonally and over the past 50 years?

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  1. Atmospheric CO2 decreases slightly in the spring and summer due to increased photosynthesis by plants on the land and sea. It then increases in the winter as respiration (decaying of plant matter) increases.

    the general overall trend has been an increase.


  2. Jay B is right, here are some good graphs.  The upper left one is the best:

    http://www.globalwarmingart.com/wiki/Car...

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