Turns out, there are a lot of people on the planet. According to some humans are pushing the scale, thus leading the planet toward ecological ruin.
I'd say there are all sorts of things causing issues, one of which is massive overpopulation. But the spin on overpopulation that I take is that people/communities have been monopolized, in more vulgar terms we have been herded into concentrated groups. Lump us all together in a cage and we start to go fucking mental. So, yeah, there are lots of social/ecological problems.
A fundamental aspect to a freed market is the necessity of movement. People must be free to move around whenever they see fit. This requires a broad approach to the principle of property rights, but such is the nature a truly freed market. We must be flexible in our social approaches for long term adaptability and stability.
When people are free to move and work as they please (as long as it is done through non-aggression), or, rather, when they have more options in front of them for their lives, pumping out kids for a living becomes one of many life choices, as opposed to the ONLY life choice.
From an economic point of view, people act according to incentives and disincentives. Therefore, a coercive welfare state and property monopolization place people in an environment where choices become quite narrowed, and they subsequently multiply like fucking gremlins in water.
In essence, a free society would broaden life choices for folks, thereby naturally bringing down overall birth rates, and thereby stabilizing our population. The effect of such a phenomenon would butterfly into social organizing and ecological responsibility. Not because of some mass ideology, but as a product of absolute freedom.