National Geographic suggests that CO2 might cause temperatures to rise by 22F and sea levels to rise by 216 feet

Rising Seas - Interactive: If All The Ice Melted

There are more than five million cubic miles of ice on Earth, and some scientists say it would take more than 5,000 years to melt it all. If we continue adding carbon to the atmosphere, we’ll very likely create an ice-free planet, with an average temperature of perhaps 80 degrees Fahrenheit instead of the current 58.