This is the story of John Muir's adventurous life, from his wild and playful boyhood in Scotland to his legendary exploits in America, where he became an inventor, a global explorer, and the first modern environmentalist -- and even made friends with a president! His heart was always in the outdoors and he aimed to experience all he could. He swung through a windstorm at the top of a tall tree, clilmbed too many mountains to count, and rode an avalanche to its end. Most importantly, though, John Muir told the world about the wonders of nature. His words made a difference and inspired people in many countries to start protecting planet Earth -- and they still do.