NANOTECHNOLOGY AND CLIMATE CHANGE: The big point is that — unlike many other proposed remedies — nanotechnology is worth developing ASAP regardless of what happens with the climate. Plus, a warning: “Be careful, though: while natural climate variability is not an existential risk — we do fine in steaming jungles and have lived through ice ages — a Weather Machine run by the same people who ran our financial system recently could be a very dangerous toy.”