Alexander von Humboldt was an intrepid explorer and the most famous scientist of his age. His restless life was packed with adventure and discovery, whether climbing the highest volcanoes in the world or racing through anthrax-infested Siberia. He came up with a radical vision of nature, that it was a complex and interconnected global force and did not exist for man's use alone. Ironically, his ideas have become so accepted and widespread that he has been nearly forgotten. Now Andrea Wulf brings the man and his achievements back into focus: his investigation of wild environments around the world; his discoveries of similarities between climate zones on different continents; his prediction of human-induced climate change; his remarkable ability to fashion poetic narrative out of scientific observation; and his relationships with iconic figures such as Simn Bolvar and Thomas Jefferson.