"Humans did not begin as a global species; we had to expand to become one. And we could not have done so without other living organisms becoming global along with us." Robert P. Clark develops in this book a global life systems perspective that delineates how biological forces mutually reinforce one another—and what their globalization has meant for both human society and the biosphere. While he resists biological "determinism," Clark traces interconnected developments among population, disease, agriculture, trade, fuels, and other life systems to more thoroughly explore and elucidate the globalization of human endeavors within an ever evolving context of nature and environment. His lucid and richly documented book offers a fresh look at social evolution and a broader basis for understanding the contemporary context for global change.