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2021 = 500-ppm CO2-equivalency
* From Andrew Glickson's book, 'Event Horizon......................', as of 2021, atmospheric greenhouse gas concentrations, from all sources, was equivalent to 500 parts per million ( ppm ) of carbon dioxide, compared to a 1850, pre-Industrial Revolution, 280-ppm.
* By Thursday I should be able to comment on what that means for us.
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