Since the advent of life on earth ions ago there have been several events that we can only classify as extinctions. See: Previous Extinctions . Plus the disappearance of many animals and plants at the hands of man in prehistoric, historic and modern times will eventually show up in the fossil record as mass extinctions. (from BBC article).
What a mess to overcome but humans are clever and it is just possible that with Earth now and the potential colony planets in this huge universe of cosmic matter, it is just possible we can do it.
This blog then is no more than this person’s optimistic view of things to come.