Meanwhile, conservationists including Aldo Leopold helped re-establish the state's forests during the early 20th century, paving the way for a more renewable lumber and paper milling industry as well as promoting recreational tourism in the northern woodlands.
Ao mesmo tempo, ecoloxistas como Aldo Leopold axudaron á repoboación forestal de comezos do século XX, dando pé a unha máis renovable industria madeireira e papeleira, e potenciando o turismo nos bosques do norte.