Introduces the period approximately 20,000 years ago when global temperatures were much colder and ice covered much of the planet, and describes how animals living during that time adapted to the environment.

"This book demonstrates that the cause of Ice Ages and smaller climate changes is fluctuation of the sun's magnetic field, which controls the intensity of cosmic rays entering the Earth's atmosphere. Condensation on particles produced by cosmic rays results in formation of clouds that control atmospheric temperatures."--Publisher's description.

Climate change has been a perplexing problem for years. In Dark Winter, author John L. Casey, a former White House national space policy advisor, NASA headquarters consultant, and space shuttle engineer tells the truth about ominous changes taking place in the climate and the Sun. Casey's research into the Sun's activity, which began almost a decade ago, resulted in discovery of a solar cycle that is now reversing from its global warming phase to...

"After the extinction of dinosaurs and before the rise of humans, there existed another group of incredible creatures. Among its ranks were woolly rhinos, mastodons, sabre-tooth tigers, giant ground sloths, and many other spectacularly large animals that are no longer with us. Today, we think of these animals as part of a group known as "Pleistocene megafauna," named for the geological era in which they lived, also known as the Ice Age. In Vanished...

Scientists squabble over the locations and dates for human arrival in the New World. The first explorers were few, encampments fleeting. At some point in time, between twenty and forty thousand years ago, sea levels were low enough that a vast land bridge was exposed between Asia and North America-- but was not the only way across. Childs provides an unsparing, vivid, revelatory travelogue through prehistory that traces the arrival of the First People...