reduction in oxygen would have enormous consequences for life on Earth.
Humans, animals, and many other organisms depend on oxygen for survival. If oxygen levels fell far below today’s levels, complex life would eventually become impossible.
According to the scenario described in the article, a mass extinction would occur as Earth’s environment became increasingly hostile.
Eventually, only certain microorganisms capable of surviving without oxygen could remain.
This would not happen suddenly. It would be a very slow process taking place over hundreds of millions of years.
What Will Happen to the Sun?
The eventual destruction of Earth’s habitability is not the end of the Sun’s story.
In roughly five billion years, the Sun is expected to enter a completely different stage of its life.
It will eventually run out of hydrogen fuel in its core and expand into a red giant.
During this stage, the Sun will become enormously larger
