carbon dioxide is the gas of life

Bill - HELP life on Earth! The early earth one-off had an atmosphere like Mars. 98% carbon dioxide! Today there is no photosynthesis on Mars so the Martian atmosphere still 98% carbon dioxide. The average Martian air temperature is -112° C. Carbon dioxide very much not a warming gas! During the Cretaceous Thermal Maximum (CTM), atmospheric carbon dioxide levels rose to over 1,000 parts per million (ppm) compared to the pre-industrial average of 280 ppm. Rising carbon dioxide resulted in a significant increase in the greenhouse effect, leading to elevated global temperatures. Weren't they paying attention in beginners geology. The earth's atmosphere had been 98% carbon dioxide. That is 980 times greater! The predecessor to photosynthesis evolved in the cretaceous. And the cretaceous mass extinction happened as carbon dioxide fell to just 10 PPM. 90% of life on earth died. A bigger mass extinction and the death of the dinosaurs. Li...