Hey bmann025. It is not disputed at all that the planet has been warmer than what it is now. This is known. It is a common trope of those who spread climate misinformation. The issue is of the speed of radiative forcing.
For example, the Paleocene-Eocene Thermal Maximum period, which occurred 56 million years ago, led to sea level rises of 12-15 metres, ocean acidification and deoxygenation, and large changes in the terrestrial biosphere and the water cycle mass. At one point, 0.6 billion tons of carbon was released by volcanoes and organic-rich sediments per year. This led to one of the smaller mass extinction events.
Today, human-induced climate change is underway because 11 billion tons of carbon are being emitted each year.
-From one who has studied and uses climatology in their career. Cheers.
New UN Climate Report - 2.7 degrees inevitable if nothing is done, page-7
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