What would happen if all of the ice in Antarctica and Greenland were to melt. Approximately the sea level would raise by 70 meters 250 feet. And there is so much carbon dioxide in the air that it would release a toxic gas causing people to cough every time you would breathe . Also any costal cities everywhere in the world would be submerged with water but other places towards the middle of the country wouldn’t be harmed yes the carbon dioxide but that could be fixed . But if this were to happened to the earth what would you do?