“At the end of a mass extinction, the tree of life has lost several branches-and yet, afterward, life does go on. Plants regreen the earth and animals repopulate the oceans; different species relentless forward march. There will be life on planet Earth after the sixth mass extinction, but we are not able to imagine it any better than the dinosaurs could have imagined a world dominated by mammals walking on two legs, driving bulldozers, and flying airplanes.”
