not quite like this! as the temp rises and the permafrost heads north, vast tracts of peat in northern canada and russia will dry out releasing a large volume of ...............................co2! no one can know what temp is too much, there are no certainties
it might, as the ice caps melt less solar energy is reflected out to space. there are many occurrences which could result in the planet's temperature running away. no one will know until it's too late