If we royally truck up the environment, we'll die off and the ecosystem will eventually balance back out. So does it matter? In regards to our own survival, sure. But as far as the earth is concerned? Life goes on.
Well, of course. It's just strange for someone to say that they found out they have the same descendants as someone else, as that means they have children with the person (and apparently didn't know it).
I'm expecting an issue when that time comes. She wants me to ask him, and he's going to want me to convert to Islam. And that's something I really don't want to do.