Seeking no one's help and asking nobody's permission, Russian geophysicist Sergey Zimov and his son Nikita are gathering any large wooly beast they can get their hands on, and transporting them, by whatever low budget means they can contrive, to the most remote corner of Siberia. They call their project Pleistocene Park. The goal: restore the Ice Age "mammoth steppe" ecosystem and avoid a catastrophic feedback loop leading to runaway global warming. Sergey would know: fifteen years ago he published in the journal Science showing that frozen arctic soils contain twice as much carbon as the earth's atmosphere. These soils are now starting to melt. While Zimov's brilliance and charisma have won him friends and supporters, his oversized ego, lack of diplomacy, and cranky iconoclasm make him a challenge to work with. Nikita, Sergey's son, is the last man standing to deal with his father's idiosyncrasies and carry forward his vision. Can two Russian scientists stave off a worst-case scenario of global environmental catastrophe and reshape humanity's relationship with the natural world?