Environmental History: Learning from the Past. Environmental History of the US 4 Eras. The environmental history of the US can be divided into 4 eras: Tribal Frontier Early conservation Environmental. Environmental History of the US Tribal Era. Tribal Era- Native Americans
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and private citizens in
to reduce dependence on foreign oil
to weaken laws of 60’s and 70’s
development and timber cutting
met to negotiate a treaty to decrease emissions and slow climate change