Guardian: Ten months have passed since pointing out that we have, at best, 100 left before a new, far more dangerous phase of global warming begins. The “chatter” of concern is getting louder. But at the same time, the political system in Britain has been wracked and absorbed more by its own inadequacies than by this fundamental threat to civilisation. The fall of the Roman Empire was due to a large extent, writes the historian Adrian Goldsworthy, to a system of government that became …