The many ways we can tell humans have overrun the planet.
I was reading a slight book on the history of my county, built around photos from our local historical society. What struck me was how bucolic it used to be, more agrarian and slow paced, yet at the same time socially vibrant. A scarcity of people makes everyone more positive about meeting and being with other people. Now the region is much more built-up, with more amenities, but less open space and seemingly less social mixing. All this got me thinking about the social indices of overpopulation.
There are many ways to evaluate human overpopulation. Famine and starvation is perhaps the simplest, a specter that was thought to be imminent in the 1970's, with "The Population Bomb". Lately we have become aware of more subtle problems that the planet has due to our numbers, like pervasive plastic pollution, deranged nitrogen and other chemical cycles, and climate heating. There has been a constant descent down ladders of resource quality, from the mastodons that were hunted out thousands of years ago, then fisheries destroyed, then ranges overgrazed, to the point that we are making hamburgers out of peas and soy beans now. Minerals follow the same course, as we go farther afield to exploit poorer ores of the critical elements like copper, aluminum, rare earth elements, helium, etc.
Sustainability is not just a word or a woke mantra. It is a specter that hangs over our future. Will humans be able to exist at our current technological level in a few hundred years? A thousand? Ten thousand? There is no way that will be possible with our current practices. So those practices unquestionably have to change.
But apart from the resource constraints that overpopulation presents, I have been struck by the sociological factors that point in the same direction, and are spontaneous responses to what is evident in the environment. In my community and the state of California, there is a vocal debate about housing. Localities have settled into a comfortable stasis, where no new housing is zoned for, existing housing values go up, and existing residents are happy. But the population of the state continues to go up, housing becomes increasingly unaffordable, and the homeless lie all over the streets and parks. There seems to be a psychological state where most current residents see the current situation as sufficiently dense- they are not interested in more growth, (We don't want to become LA!). They instinctively sense that we have collectively reached some kind of limit, given our technological setting and psychology.
Declining birth rates across the developed world point in the same direction. Perhaps the expense of raising a child into the current lifestyle is too high, but there may be something more basic going on. Likewise the broad acceptance of gay / LGBTQ lives, where previously the emphasis was on "natural" and fertile growth of the human population, without any consciousness of limits. People seem less social, less likely to go out from their cocoons and streaming pods. Political divisiveness may also be traceable to this sociological turning point, since if growth is off the table, the pie is static, and political and economic competition is increasingly zero-sum instead of collective and growth-oriented. Public works fall into this trap as well, with public agencies increasingly sclerotic, unable to plow through conflicting entrenched interests, and unable to grow, or even maintain, our infrastructure. One could invoke a general anti-immigrant sentiment as another sign, although anti-immigrant campaigns have featured periodically throughout US history, usually mixed, as now, with racial selectivity and animus.
Imaginatively, dystopias seem to rule over the science fiction universe, as Hollywood seems to take for granted a grim future of some kind, whether inflicted by aliens or AI, or by ourselves. Heroes may fight against it, but we do not seem to get many happy endings. The future just looks too bleak, if one is looking far enough ahead. It is hard to generate the optimism we once had, given the failure of the technological deliverances of the twentieth century (fossil fuels, nuclear power, fusion power) to provide a truly sustainable future. Everyone can sense, at an intuitive level, that we are stuck, and may not get a technological fix to get us out of this jam. Solar power is great, but it is not yet clear that the triumvirate of wind, solar, and batteries are truly enough to feed our need for power, let alone the growing appetites of the not-yet-fully developed world. And if it is? Human populations will doubtless grow to the point that those technologies become untenable in turn, with a hat-tip to Thomas Malthus.
We should be proud of the many great things that this period of prosperity has allowed us to accomplish. But we should grieve, as well, for the costs incurred- the vast environmental degradation which at the current pace is accelerating and compounding through many forms. Humans are not going to go extinct from these self-induced crises, but we will have to face up to the absolute necessity of sustainability over the long term, or else "the environment" will do so for us, by reducing our populations to more sustainable levels.
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