[4] Revolution begins with Stewart and an assistant in the water with sharks, and expands from there to saving the ecosystems we depend on for survival.
Stewart travels to 15 countries,[5] visiting such locations as the coral reefs of Papua New Guinea, deforested regions of Madagascar, and the Alberta tar sands.
He comes to the realization that all of our actions are interconnected and that environmental degradation, species loss, ocean acidification, pollution, and scarcity of food and water are limiting, even reducing, the Earth's ability to support humans.
[6] Traveling the globe to meet with the individuals and organizations working on a solution, Stewart finds encouragement and hope, variously pointing to the revolutions of the past and highlighting the current work of selected people.
In time, he concentrates on the efforts of the young, as they have the most to lose: climate change and environmental collapse could take long enough that their elders may not be around to see the worst of what they have done.