Mayim Bialik

Neuroscientist, Mental Health Advocate & Actress Known for "The Big Bang Theory"

Bill Nye

"The Science Guy"; Science Communicator, TV Presenter & Mechanical Engineer; Climate Change Activist

Alexis Ohanian

Co-Founder of Initialized Capital & Co-Founder of Reddit; Entrepreneur, Investor, Activist & Bestselling Author

Alexis Ohanian Carthage College Commencement Address 2014

Jeff Orlowski-Yang

Award-winning Filmmaker, Photographer, Entrepreneur & Climate Change Activist

Jessica Alba

Actress; Entrepreneur; Founder & CEO of The Honest Company

Don Cheadle

Actor, Activist & Author; Known for "Iron Man 2" & "Hotel Rwanda"

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Alicia Silverstone

Actress & Animal Rights Activist

Danni Washington

TV Host, Science Communicator, Ocean Explorer & Nature Advocate

Alyssa Milano

Actress, Author, Philanthropist & Founder of Touch by Alyssa Milano; Known for "Charmed" and "Who's the Boss"

Gisele Bundchen

Supermodel, Philanthropist & United Nations Environment Program Goodwill Ambassador

Sigourney Weaver

Golden Globe-Winning Actress & Environmentalist

Harrison Ford

Award-Winning Actor Known for "Star Wars" & "Indiana Jones"

John Browne

Former CEO of BP & Author of "The Glass Closet: Why Coming Out Is Good Business"

Arnold Schwarzenegger

Actor, Producer, Director, Writer; California’s 38th Governor; Host of "Celebrity Apprentice"

Alexis Nikole Nelson

Wild Food Maker at BlackForager; TikTok Sensation

Hank Green

#1 New York Times Best-Selling Author & CEO of Complexly

Mary Steenburgen

Character Actress; Best Known for her Role in "Philadelphia"

Scott Eastwood

Model & Actor Known for "The Longest Ride"

Matt Petersen

President and CEO, Los Angeles Cleantech Incubator

Governor George Pataki

Former Governor of the State of New York

Adam Lowry

Co-Founder & Chief Greenskeeper of Method Products