Human overpopulation is a global fact. There are too many of us. We need to work out what to do about it before it is too late. It there were fewer of us we would not be facing extinction. The situation is complex, but this aspect of it is plain enough. We have reached plague proportions. Already there is mass extinction of other species. We have already entered a catastrophe. It is not too late to limit some of the damage we are causing. These are some facts. I am not being alarmist. If you are alarmed, that’s an appropriate response to a shared problem. If you would be alarmed if you saw that what I’m saying is true, that is not my fault.