&#62; The people of the Maldives want the temperature rise regulated below 1.5 C.<p>Do they?  Or, do they want a given sea level?<p>Note that sea level may well be independent of CO2.  (That's part of why I mentioned artic ice, which has been increasing.)<p>&#62; There are certain acceptable limits.<p>And you're assuming quite a bit about a lot of things, such as the relationship between CO2 and temperature and sea level.<p>&#62; Surely we can't risk a global temperature rise of 10 C?<p>I don't know and that may not be the question.  I've posted links showing CO2 levels several times what it is now.  What was the temperature then?  (Since those times were in the past, it's absurd to argue that whatever happens at those concentrations is irreversible.)