Of course, Hansen is not an actual climate scientist, so, according to Warmist doctrine we aren’t supposed to listen to him
(Scientific American) If the number reaches 560 ppm, a doubling of preindustrial values, sea level globally could rise 25 meters, according to Eelco Rohling, professor of ocean and climate change at University of Southampton in the U.K., who presented data at the AGU meeting with Hansen. Many large cities worldwide lie at that elevation or lower. The two scientists agreed that if nations continue to emit CO2 at current rates, the world could reach 560 ppm by 2100.
The paleoclimate record also shows that 560 ppm would be enough to melt all the ice in the Arctic, and later the Antarctic. Rohling said that once the Antarctic melts, sea levels would rise by 60 to 70 meters. “If governments keep going the way they are going,” Hansen added, “the planet will reach an ice-free state.”
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. Notice he mentions “governments”, which means that a) they should keep giving him money and b) government should pass lots if AGW legislation.
, whose headline reads “Bummer: Jim Hansen and another raving lunatic suggest that tweaking CO2 would melt all of the world’s ice, raising sea levels by up to 229 feet.”