Quote:
Originally Posted by freebeard
When was that? Before or after Doggerland.
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* the last time Earth had 400ppmv carbon dioxide in the atmosphere was during the Eemian Period, 120,000 years ago.
* Earth's global average near-surface temperature was 61.4 F.
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Taking the Milankovich orbital forcing cycles into account, Earth was not the same as today. And 400ppmv will do things today, that would not have happened 120,000 years ago.
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120,000 years ago, Earth's atmosphere wasn't full of coal-fired power plant sulfate aerosols, causing global cooling, as today.
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120,000 years ago, there were no:
Chloroflourocarbons
Hydroflourocarbons
Hydrochloroflourocarbons
Anthropogenic methane
Nitrous Oxide
Nitrogen Oxides
Nonmethane Volatile Organic Compounds ( NMVOCs)
Perflourocarbons
or Sulfur hexaflouride ( SF6 )
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120,000 years ago, there were no bunker-oil-fired cargo ships or luxury liners spewing black carbon onto sea-ice, ice-shelves, or glaciers.
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120,000 years ago, the Permafrost wasn't releasing a potential 105,000-billion tonnes of carbon dioxide-equivalence into the atmosphere.
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* In addition to the up to 30-feet of sea-level rise we had, you can consider:
Greenland = 22.96-feet sea-level rise
W. Antarctic = 16.4-feet sea-level rise
E. Antarctic = 160.6-feet sea-level rise
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Sure! No one knows the precise timing of how soon, or not, we'll experience an Ice-free planet, but the set-up has been in play for over 150-years.
Glaciologists are scared ----less.