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"...according to Dr. Eelco Rohling, the world could reach 560ppm (of CO2) by 2100...560ppm would melt all Arctic ice, and later the Antarctic. Rohling said that once the Antarctic melts, sea levels would rise 60m-70m and 'the planet will reach an ice-free state.' "
---Scientific American 6 Dec 2011
So, according to Hansen the planet has been ice free for most of its history, since CO2 has been at higher levels than today for the past 4.5 billion years.
SchlossOtranto 1 month ago
urgeist [dot] org
Wahn666 2 years ago
Hansen has a way of explaining complicated science by making it easy for the average person to comprehend. He has a vast knowledge about climate change and what the world needs to do about it.
Simplex1swrhs90 2 years ago