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I am a cheerful person most of the time and I have been trying for decades to add a little cheer to those whom I encounter. I remember the exact moment and place where that happened. Not the date, but the thoughts and feelings of being depressed about things in general as I approached the Med, my coffee rendezvous for decades. I wasn’t going to visit my gloom upon my friends and decided to be cheerful. I was able to maintain that false cheer for a few minutes, until the conversation became interesting, which it always did, and I forgot to be cheerful and returned to my anxious gloom. Each on the next several days I remade the promise to myself to be cheerful toward my friends and every day the same result. I forgot myself and returned to my gloomy state and proceeded to pull the happy discussions down a notch.
The next experiment was not trying to be cheerful but to watch my friends behavior and try and help them to become cheerful. That worked a lot better because it is easier to watch another person’s expressions than to watch one’s self. I cultivated some habits around that simple strategy for not being gloomy and by helping my interlocutors to be happier I became happier too. I have long given up doing these experiments intentionally, but the habits are still with me, and often when a group as I was today, I notice that people are laughing along with me as I develop my arguments on whatever it is that we are all chewing on.
With that nonsense exposed it is time to face a simple and obvious fact of current reality. The population of the world is still exploding and the resources of the world are about to become too difficult to retrieve. Malthus said that two hundred years ago and was wrong because he didn’t factor in the energy reserves provided by coal and oil and a few smaller energy sources, and the creativity of humanity to develop ways to exploit our planetary resources. Paul Ehrlich brought this to the modern world in his 1968 book The Population Bomb, but once again the creativity of the unified human species was able to delay the onset of population collapse. The bad luck that those two predicted is about to run out because of the infinite capacity of living organisms to reproduce, it doesn’t even have to be a logarithmic growth a simple tiny growth will do if it is infinite it will consume all of the resources available to its species. We are still in a fortunate condition for enjoying the good life the Earth is still providing to us. But, even us geriatrics may witness the tipping point, and young adults will have an increasingly difficult time, and it brings tears to my eyes sometimes when I see happy children and realize that they are unlikely to live to my age without experiencing a wrenching suffering of humanity.
But, I’ve run out of time again and once again my advice is to enjoy yourself.
Probaway - Life Hacks 
You forgot to mention that Foerster predicted that human population would become infinite by 2026 because, at the time, population growth was hyperbolic and beyond exponential. While science and math are excellent ways to solve problems their predictions are often wrong, especially when it comes to human kind. The problem is one of unknown variables.
“The limits to knowledge create a ‘fatal conceit’ that we know more than we do, and thusly, we sometimes try to think, plan and predict in ways we cannot.”
Paraphrased from – F.A. Hayek
It is a fatal conceit to subordinate the welfare of human beings to unproven political theories about nature.
R.L. Darby
Your gloom about population, global warming, and resources is a fatal conceit.
You only know what you have been told by others who suffer from the same fatal conceits like those of Malthus and Ehrlich who were wrong on every prediction.
Human ingenuity and discovery contain many unknowns that suggest all of these problems will be easily solved in a future of countless unknowns. Just like they have been. Doomsday predictions have been wrong throughout human history. Have a little faith in human kind and accept the fact that you don’t know enough to be gloomy about anything. Indeed you should be thankful that you are still alive. Send all the gloom to the national socialists who are losing on every ideological front. They do so thrive on, and love, both the misery and gloom (that they inflict). If you want to see real misery and gloom move to any socialist nation like North Korea, Venezuela or Cuba.
Each and every day when I awaken, I smile and say; “Aha, made it again!” The wonder and joy never end. For this is a day that the lord God hath made. Let us rejoice and be glad in it.