Wednesday, April 05, 2006
bluffs at Ballona
There were a few other times when our planet went through such changes in a short period of time. The first great death happened when the first organisms to photosynthesize created so much oxygen it killed the methane breathers... Then there was another great death when atmospheric oxygen plummeted from 21% to less then 12 % in only 20 million years. Land vertebrates at sea level had the same amount of oxygen as if they were at present day 9,200 foot mountain ... The Late Permian Early Triassic saw 90 % of the ocean organisms die and 75 % of the land plants and animals die. What a horrible death it must have been for not only did the oxygen vanish, but CO2 increased and with it temperatures. The earth became a steamy hot box with not much to breath...