That's fine, because population will not begin to decline for another 25 years. Our children can figure out how to do it, and then our grandchildren can put it into practice, if they care to; but they may feel, as I do, that it would be much easier to create a sustainable civilization with a substantially smaller population than the one we have today.
Under the assumption that the earth's biosphere is a self-regulating system, population decline can't be considered a bad thing. Human economy certainly is not the measure of it's survival. There is a limit to senseless growth and finding a balance will be enforced by our environment's self-regulation.
"Some people will point to different reasons for this happening but they all fall apart under close scrutiny<p>1) People can't afford kids.<p>That does't make sense. The world is richer now than ever before."<p>The WORLD is "richer" than ever before. People aren't.
The answer here is pretty simple — you take money, resources, etc from people who don't reproduce and you redistribute them to the people who do until the population stops declining.