Life on Earth was nearly doomed by too little CO2 | Watts Up With That?- During the last ice age, too little atmospheric carbon dioxide almost eradicated mankind
"...What few realize, however, is that during the last Ice Age too little CO2 in the air almost eradicated mankind.
That’s when much-colder water in oceans (that were 400 feet shallower than today) sucked most of the carbon dioxide from the air; half of North America, Europe and Asia were buried under mile-high glaciers that obliterated everything in their paths; and bitterly cold temperatures further retarded plant growth...
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