But scientists have found evidence of tropical climates at the poles. When do we get that part of the cycle?
But scientists have found evidence of tropical climates at the poles. When do we get that part of the cycle?
The antarctic has not always been where it is located today, at one time that landmass was much closer to the equator, it moves due to continental drift to the southern pole, hence no tropical climate for that land mass anymore.
If you want to guess on a world wide heat up with no or little polar ice, figure on at least a few million years to get through the current series of ice ages.
We have got anywhere from 10 to 50 million years before another real heatup to global tropical temps if ever.
Global Temperature and Atmospheric CO2 over Geologic Time Late Carboniferous to Early Permian time (315 mya -- 270 mya) is the only time period in the last 600 million years when both atmospheric CO2 and temperatures were as low as they are today (Quaternary Period ). Temperature after C.R. Scotese CO2 after R.A. Berner, 1994
- There has historically been much more CO2 in our atmosphere than exists today. For example, during the Jurassic Period (200 mya), average CO2 concentrations were about 900 ppm or about 2.5 times higher than today. The highest concentrations of CO2 during all of the Paleozoic Era occurred during the Ordovician Period, exceeding 6000 ppm -- more than 16 times higher than today.
- The Carboniferous Period and the Ordovician Period were the only geological periods during the Paleozoic Era when global temperatures were as low as they are today.
To the consternation of global warming proponents, the Late Ordovician Period was also an Ice Age, with CO2 concentrations nearly 15 times higher than today-- 5500 ppm. According to greenhouse theory, Earth should have been exceedingly hot. Instead, global temperatures were no warmer than today. Clearly, other factors besides atmospheric carbon influence earth temperatures and global warming.
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There's no proof for an ice age since the Earth is populated with the species that shared or still share the planet with homo sapiens.
The opposite is true - ice age impossible during that period.