> So yeah its enough. I realize that was a very imprecise statement on my part. Not enough to sterilize a planet is what I meant. It certainly is enough to cau

> So yeah its enough. I realize that was a very imprecise statement on my part. Not enough to sterilize a planet is what I meant. It certainly is enough to cause a dent, even a huge dent, in the ecosystem. > Sometimes I wonder about unexplained civilization collapses and GRBs You wouldn't be the first, I think it's certainly probable these events did play a role in both prehistoric population changes as well as civilization collapses.