And he’s dead serious about us “risking nothing less than the future of our entire planet.”

BOSTON (AP) — U.S. Secretary of State John Kerry on Monday challenged Boston College graduates to turn the Jesuit institution’s words of “men and women for others” into actions.

Kerry, who graduated from college’s law school in 1976, told the packed stadium to embrace the “spirit of service” and help preserve the dignity of all races, ethnicities and sexual orientations.

He also urged B.C.’s approximately 4,000 undergraduate and graduate students to take part in the struggle against global warming.

“If we do nothing and it turns out the critics and the naysayers and the members of the Flat Earth Society, if it turns out that they’re wrong, it turns out we are risking nothing less than the future of our entire planet,” said Kerry, who spent a significant part of his 28 years as a U.S. Senator of Massachusetts fighting for clean energy.