On Dec 21, 6:49*pm, "Ryan P."
wrote:
ecarecar wrote:
The CO2 then broke down??

How did that happen?

.
.
* Photosynthesis is one good example.

Correct. Plants intake CO2, absorb the carbon, and exhale the
oxygen.
The very warm weather produced an abundance of plant life, with few
animals in the food chain to eat them. The bigger the plants grew,
the more photosynthesis for conversion of CO2 to O.