Christine Todd Whitman was governor of New Jersey (1994-2001)
Environmental Protection Agency Administrator (2001-2003)

She had a decent, not great, environmental record.
She was a member of Republicans for Environmental Protection, now ConservAmerica -- Conservation is Conservative

In 2003 Whitman published a book titled "It's My Party Too: The Battle for the Heart of the GOP and the Future of America", in which she encouraged moderates to take the party back from the radical right.

Whitman was George W Bush's EPA administrator. In 2001, the EPA produced a report detailing the expected effects of global warming in each state in the country. President Bush dismissed the report as the work of "the bureaucracy."

The Bush administration had the National Security Council control EPA communications after the September 11 attacks, and watered down reports of air safety in downtown manhattan.

In 2003 after having several public conflicts with the Bush administration, Whitman resigned. In an interview in 2007, Whitman stated that Vice President Dick Cheney's insistence on easing air pollution controls, not the personal reasons she cited at the time, led to her resignation.

Christine Todd Whitman - Wikipedia