The 2012 Clean50 are, by category:

Advocacy & NGOs:
Dr. John D. Wiebe, Gerald Butts, Marlo Raynolds, Ed Whittingham

Angels, Investors & Eco‑system Support:
Andrée‑Lise Méthot, Tom Rand, Thomas Rankin

Building, Design & Development:
Geoff Cape, Peter Busby, Scott Demark

Clean Technology:
David Demers & the Westport Team, Charles Cartmill, Brent Perry

Consulting:
Chad Park, Stephen Carpenter, Marty Janowitz

Corporate Social Responsibility (CSR) Practitioners:
Kevin Brady, Coro Strandberg

Education:
Dr. Peter Victor, Dr. Tima Bansal, Raymond Côté, Dr. Brenda McCabe, Dr. Kim Pressnail, Marianne Touchie, Ekaterina Tzekova

Financial Services:
Don Roberts, Shari Austin, Karen Clarke‑Whistler, Michael Jantzi

Manufacturing & Transportation:
Scott Deugo, Ted Zettel

Primary Resources:
Antony Marcil, Tye Burt, Frank Dottori, Gord Lambert, Bob Mitchell

Public Sector & Politicians:
Dr. Vicky Sharpe, Gerald Farthing, Dalton McGuinty

Renewable Energy Generation:
Tom Heintzman, Kent Brown, Vincent Chornet, J. Ross Keating, John Keating, David Stevenson, David Swan

Research & Development:
John Paul Morgan, Dr. Phillip Jessop, Dr. Ted Sargent

Retail & Consumer Products:
Ian Morton, Tyler Elm, Andreas Souvaliotis, Galen G. Weston

Technology, Telecom & Media:
Lloyd Bryant, Jeffrey Simpson

Traditional Energy Generation:
Ed Martin, James Taylor