CO2 Levels

CO2 levels before the industion revolution where about 280 parts per million.

We starting testing them atmospherically in 1958 and now test them all over
the world daily and even via satellites.

Currently CO2 levels are 410 parts per million and we will go through an
interesting milestone within 5 years.
When we reach 420 parts per million we will have an atmosphere with 50%
more CO2 in it then before we started our exciting planetary scale fossil fuel
experiment.

https://www.esrl.noaa.gov/gmd/ccgg/trends/full.html

https://www.co2.earth/

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CO2 Levels