As he takes us on these myriad travels, Lopez also probes the long history of humanity's quests and explorations, including the prehistoric peoples who trekked across Skraeling Island in northern Canada, the colonialists who plundered Central Africa, an enlightenment-era Englishman who sailed the Pacific, a Native American emissary who found his way into isolationist Japan, and today's ecotourists in the tropics. Throughout his journeys--to some of the hottest, coldest, and most desolate places on the globe--and via friendships he forges along the way with scientists, archaeologists, artists and local residents, Lopez searches for meaning and purpose in a broken world. Horizon is a revelatory, epic work that voices concern and frustration along with humanity and hope--a book that makes you see the world differently, and that is the crowning achievement by one of America's great thinkers and most humane voices.