Eric Chivian and Richard Cizik

AGE: 66 and 57, respectively
PREVIOUS APPEARANCES ON THE TIME 100: 1

PRO: Chivian is a professor of psychiatry at Harvard, while Cizik is one of the world's foremost Evangelicals. Despite their seemingly contradictory dogmas, the two men have united theologians and scientists in a common cause: protecting the earth.

CON: This winter, Cizik was forced to resign from the National Association of Evangelicals after making statements in favor of same-sex unions. Will the uproar distract from his environmental work?

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