To be more precise, the number of workers supporting an elderly person has been declining, giving a larger burden to those that are left. With longer longevity rates the cost of medical care to keep these walking cadavers increases while the number of workers paying taxes to maintain the aging population increases. Thus the decision via the "tyranny of small decisions" (Economist Alfred E Kahn's phrase) , not to have children, has enormous consequences for society in the long run. In Europe the consequence may be that the muslim workers who will make the major part of the labor force will refuse to pay for the upkeep of aging decrepit white folks. All our decisions one way or the other have consequences. To argue otherwise is to be totally detached from reality.
So, having kids impacts the world. Not having kids impacts the world. Gotcha.
Now, if you'll excuse me I'm going to have fun with my wife with no intention of having kids this weekend. I apologize if anyone else is affected.
Well, actually, no, I don't apologize.