01:51
Respecting Planet Earth
Former Sierra Club president David Brower talks about some of the ways humans have damaged planet Earth in the quest for material possessions and wealth. He invokes Henry David Thoreau's sentiment that there's no use for a house if you haven't got a...
02:47
The Delicate Balance, Part 1: John Muir
One of the first voices in the environmental consciousness movement was John Muir, who lobbied for preservation and the creation of the National Park System. He also founded the Sierra Club in 1892.