Great audiobook to ponder while doing housework. Bryson's delves into the biology and geology of our planet, and how very fragile it is. Bryson makes a strong argument for the extinction of homosapians, not a matter of if but how and when. Yet you walk away feeling hopeful, almost relieved. If someone can spell it out so clearly, just maybe there is a chance that, as Dr. Malcom said, "Life will find a way."