Interesting stuff...
Is the ability to be human one of them? We are fast losing that one even if we have lost on concrete.
When there are too many people in the world, people tend to become more selfish. In 1960, there were only about 3 billion people, and in 2023 there are now more than 8 billion. We can't sustain that kind of population growth for very long without supplies, food and housing, becoming more scarce. When things become scarce, people tend to just look out for themselves.