(RIO DE JANEIRO, Brazil) — Renowned rain forest defender Marina Silva resigned as Brazil's environment minister on Tuesday, saying she lacked the necessary political support to protect the Amazon.

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Dirk Kempthorne's arrival in Washington as secretary of the interior raised hope among conservationists that he would moderate the Bush administration's aggressive search for oil and gas in some of the country's most environmentally sensitive lands. This has not happened.

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John Muir was America's first and most influential conservationist, impressing upon Theodore Roosevelt the need to create National Parks.

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