Rachel Carson (1907–64)
1854 Henry David Thoreau’s book Walden describes a social experiment to live the simple life in tune with nature. It is seen as an inspiration for the environmentalist movement.
1949 A Sand County Almanac by Aldo Leopold proposes a deep ecology of people living in harmony with the land.
1970 The US establishes the Environmental Protection Agency (EPA).
1989 Bill McKibben’s book The End of Nature highlights the dangers of global warming.
2006 The documentary An Inconvenient Truth records former US vice president Al Gore’s efforts to educate the public about climate change.