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The ice floats on the Arctic Ocean. If it melted sea levels would not be affected.
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There is a significant amount of ice covering Greenland, which would add another 7 meters (20 feet) to the oceans if it melted.
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Water is most dense at 4 degrees Celsius. Above and below this temperature, the density of water decreases (the same weight of water occupies a bigger space). So as the overall temperature of the water increases it naturally expands a little bit making the oceans rise.
Global warming would make the oceans rise. But they aren't, so it isn't. RFKjr is a fool.
Whatever - time will tell ... RFK is a jerk anyway, he's no scientist ... seems all the Kennedy's have a fixation with water ....