We are not, of course, optimistic about our chances of success. Some form of ecocatastrophe, if not thermonuclear war, seems almost certain to overtake us before the end of the century. (The inability to forecast exactly which one - whether plague, famine, the poisoning of the oceans, drastic climatic change, or some disaster entirely unforeseen - is hardly grounds for complacency.)

If some individuals contribute to general social deterioration by overproducing children, and if the need is compelling, they can be required by law to exercise reproductive responsibility — just as they can be required to exercise responsibility in their resource-consumption patterns — providing they are not denied equal protection

The development of a long-term sterilizing capsule that could be implanted under the skin and removed when pregnancy is desired opens additional possibilities for coercive fertility control. The capsule could be implanted at puberty and might be removable, with official permission, for a limited number of births.

We are not, of course, optimistic about our chances of success. Some form of ecocatastrophe, if not thermonuclear war, seems almost certain to overtake us before the end of the century. (The inability to forecast exactly which one - whether plague, famine, the poisoning of the oceans, drastic climatic change, or some disaster entirely unforeseen - is hardly grounds for complacency.)

A program of sterilizing women after their second or third child, despite the relatively greater difficulty of the operation than vasectomy, might be easier to implement than trying to sterilize men.

The e-mails are mainly about a controversy over a particular data set and the ways a particular small group of scientists have displayed that dataset.

To date, there has been no serious attempt in Western countries to use laws to control excessive population growth, although there exists ample authority under which population growth could be regulated.