The human ingenuity that helped expand the human race could well work to destroy it.
The probability that the human race will be drastically reduced in magnitude has risen meaningfully in modern times.
As an economic historian, I have always been fascinated by big changes occurring over time. The ultimate change, over the longest possible passage of time, relates to the creation and destruction of galaxies, planets, and related celestial debris. Confining ourselves to Earth, it relates to the creation and destruction of various forms of life over time.
