In 2006, one of the hottest years on record, a “pizzly” was discovered near the top of the world. Half polar bear, half grizzly, this never-before-seen animal might be dismissed as a fluke of nature. Anthony Barnosky instead sees it as a harbinger of things to come.

In Heatstroke, the renowned paleoecologist shows how global warming is fundamentally changing the natural world and its creatures. While melting ice may have helped produce the pizzly, climate change is more likely to wipe out species than to create them. Plants and animals that have followed the same rhythms for millennia are suddenly being confronted with a world they’re unprepared for—and adaptation usually isn’t an option.

This is not the first time climate change has dramatically transformed Earth. Barnosky draws connections between the coming centuries and the end of the last ice age, when mass extinctions swept the planet. The differences now are that climate change is faster and hotter than past changes, and for the first time humanity is driving it. Which means this time we can work to stop it.

No one knows exactly what nature will come to look like in this new age of global warming. But Heatstroke gives us a haunting portrait of what we stand to lose and the vitality of what can be saved.

Threats to biodiversity, food shortages, urban sprawl . . . lessons for environmental problems that confront us today may well be found in the past. The archaeological record contains hundreds of situations in which societies developed long-term sustainable relationships with their environments—and thousands in which the relationships were destructive. Charles Redman demonstrates that much can be learned from an improved understanding of peoples who, through seemingly rational decisions, degraded their environments and threatened their own survival. By discussing archaeological case studies from around the world—from the deforestation of the Mayan lowlands to soil erosion in ancient Greece to the almost total depletion of resources on Easter Island—Redman reveals the long-range coevolution of culture and environment and clearly shows the impact that ancient peoples had on their world. These case studies focus on four themes: habitat transformation and animal extinctions, agricultural practices, urban growth, and the forces that accompany complex society. They show that humankind's commitment to agriculture has had cultural consequences that have conditioned our perception of the environment and reveal that societies before European contact did not necessarily live the utopian existences that have been popularly supposed. Whereas most books on this topic tend to treat human societies as mere reactors to environmental stimuli, Redman's volume shows them to be active participants in complex and evolving ecological relationships. Human Impact on Ancient Environments demonstrates how archaeological research can provide unique insights into the nature of human stewardship of the Earth and can permanently alter the way we think about humans and the environment.