Someone in the crowd stood and asked him about the possibility of a population explosion, and he nodded. “Yes of course. This is a real problem. You don’t have to be a demographer to see that if new ones continue being born while the elderly are not dying, population will quickly soar to incredible levels. Unsustainable levels, until there will be a crash. So. This has to be faced now. The birth rate simply has to be cut, at least for a while. It isn’t a situation that has to last forever. The longevity treatments are not immortality treatments. Eventually the first generations given the treatment will die. And therein lies the solution to the problem. Say the current population on the two worlds is fifteen billion. That means we’re already starting from a bad spot. Given the severity of the problem, as long as you get to be a parent at all, there is no reason to complain; it’s your own longevity causing the problem after all, and parenthood is parenthood, one child or ten. So say that each person partners, and the two parents have only a single child, so that there is one child for every two people in the previous generation. Say that means seven and a half billion children out of this present generation. And they are all given the longevity treatment too, of course, and cosseted until they are no doubt the insufferable royalty of the world. And they go on to have four billion children, the new royalty, and that generation has two, and so on. All of them are alive at once, and the population is rising all the time, but at a lower rate as time passes. And then at some point, maybe a hundred years from now, maybe a thousand years from now, that first generation will die. It may happen over a fairly short period of time, but fast or slow, when the process is done, the overall population will be almost halved. At that point people can look at the situation, the infrastructure, the environments of the two worlds— the carrying capacity of the entire solar system, whatever that might be. After the biggest generations are gone, people can start having two children each, perhaps, so that there is replacement, and a steady state. Or whatever. When they have that kind of choice, the population crisis will be over. It could take a thousand years.”