If the universe is running down like a clock, the clock must have been wound up at a date which we could name if we knew it. The world, if it is to have an end in time, must have had a beginning in time.
I question myself every day. That's what I still find motivating about this. I don't have the answers, I don't pretend that I do just because I won the match. Just keep fighting and maybe something good happens.
Often extinctions in the ocean occur at the same time as those on land. Then again, the ice age extinctions lost many big animals, but not many sea faring ones.