Peter D Ward

By looking backward at the course of great extinctions, a paleontologist sees what the future holds. More than 200 million years ago, a cataclysmic event known as the Permian extinction destroyed more than 90 percent of all species and nearly 97 percent of all living things. Its origins have long been a puzzle for paleontologists. During the 1990s and the early part of this century, a great battle was fought between those who thought that death...

"In the 1700s, Jean-Baptiste Lamarck first described epigenetics to explain the inheritance of acquired characteristics; however, his theory was supplanted in the 1800s by Darwin's theory of evolution by natural selection through heritable genetic mutations. But natural selection could not adequately explain how rapidly species re-diversified and repopulated after mass extinctions. Now advances in the study of DNA and RNA have resurrected epigenetics,...

The gorgons ruled the land long before there were any dinosaurs, until an environmental cataclysm 250 million years ago annihilated them--along with 90 percent of all plant and animal species on the planet--in an event so terrible even the extinction of the dinosaurs pales in comparison. For more than a decade, Ward and his colleagues have been searching South Africa's Karoo Desert for clues to this world: What were these animals like? How did they...

Planet Earth is middle-aged. Science has worked hard to piece together the story of the evolution of our world up to this point, but only recently have we developed the understanding and the tools to describe the entire life cycle of a planet. Ward and Brownlee, a geologist and an astronomer respectively, combine their knowledge of how the critical sustaining systems of our planet evolve through time with their understanding of the life cycles of...

"The history of life on Earth is, in some form or another, known to us all-- or so we think. [This book] offers a provocative new account, based on the latest scientific research, of how modern lifeforms evolved"--Amazon.com.