The ultimate seed vault is being carved into a frozen, Arctic mountainside. And it will be guarded by polar bears.

Though global warming's impacts are already beginning to be visible in many places, the real impacts will likely come decades from now. Which is one reason why New York Times science writer Andrew Revkin decided to pen a book for the audience who will be most affected: today's kids. The North Pole Was Here: Puzzles and Perils at the Top of the World follows climate scientists trying to understand the future of the North Pole and the planet itself.