Of the 42 presidents, only 17 have occupied the Oval Office. Discover more about the President's Office.

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President Bush on Tuesday said, "With all these steps, we have charted the way toward a more promising era in environmental stewardship. We have pioneered a new model of cooperative conservation in which government and private citizens and environmental advocates work together to achieve common goals. And while there's a lot more work to be done, we have done our part to leave behind a cleaner and healthier and better world for those who follow us on this Earth." More Videos

View these historical photographs of the presidents and first ladies in rooms of the White House

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