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Highlighted Article: A global context for Man-made Climate Concerns

Posted On:
Jul 15, 2021 at 3:00 AM
Climate Change


From: edmhdotme

Date: June 26, 2021


A global context for Man-made Climate Concerns


Earth has existed for some 4,600 million years.  This condensed history sets the current concerns about the level of atmospheric CO2 and the possible recent impact of extra Man-made CO2 affecting global temperature in a rational context.


CO2 in the atmosphere

To understand the context of current concerns about the increase of CO2 in the atmosphere from the Man-made activities, it is useful to review the long-term history of the Earth’s atmosphere.


Composition of Earth's atmosphere


  • as far as the development of life on Earth was concerned the first 4,000 million years were comparatively uneventful.  It took evolution all that time to make any advances beyond single cell/algal organisms.
  • in those earlier times, ~3,300 million years ago CO2 had reached its maximum level of about 35%, 350,000 ppmv:  atmospheric CO2 concentration has progressively diminished ever since.
  • it was only when photosynthesis took hold, that the level of atmospheric Oxygen could rise to its current level of ~22% of the atmosphere.
  • over the same period CO2 concentrations diminished as plant photosynthesis used the sun’s energy to convert atmospheric CO2 to sugars and thus to generate all other types of organic molecules associated with life.
  • CO2 has progressively disappeared from the atmosphere both being absorbed by the Oceans to be sequestered by Ocean life as limestones or later converted into fossil fuels from luxuriant Plant growth.
  • as a result atmospheric CO2 has reduced by some thousand fold from its high point of 35%, 350,000ppmv to arrive at the current levels around 400+ppmv." ...


A global context for Man-made Climate Concerns