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For 80% of time, planet Earth has been a warm wet greenhouse planet. Polar icecaps are rare, plants have only be on Earth for 10% of time and 99.99% of all life that has ever existed is extinct. Global atmospheric CO2 and CH4 have been variable over time and have decreased over time whereas O2 has been in the atmosphere for 50% of time, has greatly fluctuated and has increased over time.