What is the source of 76% of all atmospheric CO?

A. industry
B. transportation
C. power plants
D. natural sources

Easily natural sources, but.

The problem is that there are natural sources and natural sinks for CO2. The balance is delicate and we're upsetting it.

Check out this graph. The little peaks and valleys are natural effects, due to summer (plants grow) and winter (plants are dormant). But the natural stuff is completely overwhelmed by the CO2 man pumps out, causing a rapid rise in CO2 levels.


Lots more about this:

D natural sources mostly from cellular respiration

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