"The Coronavirus is serious enough but it's worth recalling that there is a much greater horror approaching, we are racing to the edge of disaster, far worse than anything that's ever happened in human history. … In fact there are two immense threats that we are facing. One is the growing threat of nuclear war, which has exacerbated it by the tearing what's left of the arms control regime and the other of course is the growing threat of global warming. Both threats can be dealt with but there isn't a lot of time. … If we don't deal with them we're done."