That man should have dominion “over all the earth, and over every creeping thing that creepeth upon the earth” is a prophecy that has hardened into fact. So pervasive are human impacts on the planet that it’s said we live in a new geological epoch: the Anthropocene. The question we now face is: Can we change nature, this time in order to save it? Elizabeth Kolbert, the Pulitzer Prize-winning author of The Sixth Extinction, takes a hard look at the new world we are creating.

Abraham Lincoln grappled with the greatest crisis of democracy that has ever confronted the United States. While many books have been written about his temperament, judgment, and steady hand in guiding the country through the Civil War, we know less about Lincoln’s penetrating ideas and beliefs about democracy, which were every bit as important as his character in sustaining him through the crisis. Allen C. Guelzo, one of America’s foremost experts on Lincoln, captures the president’s firmly held belief that democracy was the greatest political achievement in human history.

Taking listeners from the melting Alaskan permafrost to storm-torn New Orleans, acclaimed journalist Elizabeth Kolbert approaches this monumental problem from every angle. She interviews researchers and environmentalists, explains the science, draws frightening parallels to lost civilizations, and presents the moving tales of people who are watching their worlds disappear.

The stories we usually tell ourselves about climate change tend to focus on the damage inflicted on human societies by big storms, severe droughts, and rising sea levels. But the most powerful impacts are being and will be felt by the natural world and its myriad species, which are already in the midst of the sixth great extinction. Rising temperatures are fracturing ecosystems that took millions of years to evolve, disrupting the life forms they sustain--and in many cases driving them towards extinction. The natural Eden that humanity inherited is quickly slipping away.

For all of neuroscience's advances, we've made little progress on its biggest question: How do simple cells in the brain create intelligence? Jeff Hawkins and his team discovered that the brain uses map-like structures to build a model of the world - not just one model, but hundreds of thousands of models of everything we know. This discovery allows Hawkins to answer important questions about how we perceive the world, why we have a sense of self, and the origin of high-level thought.