Daniel Hillel

饰：Self - Retired Professor of Soil Physics and Hydrology and Senior Research Scientist

Elaine Ingham

饰：Self - President and Director of Research, Rodale, 2011; President and Director of Research, Soil Foodweb Inc 1996-2011

Fred Kirschenmann

饰：Self - Farmer, Distinguished Fellow at the Leopold Center for Sustainable Agriculture, President of the Board, Stone Barns Center for Food and Agriculture

Penny Livingston-Stark

饰：Self - Co-Director of the Regenerative Design Institute and Co-Manager of the Commonweal Garden Organic Farm, Bolinas, CA

Kate Scow

饰：Self - Professor of Soil Science and Microbial Ecology Department of Land, Air and Water Resources

Warren Weber

饰：Self - Farmer, Star Route Farms, Bolinas, CA

Paul Hepperly

饰：Self - Research Director 2002-2009, The Rodale Institute

Oliver Chadwick

饰：Self - Professor of Geography

Charles Benbrook

饰：Self - Chief Scientist of The Organic Center

Jaspal Singh Chattha

饰：Self - Farmer, J & P Organic Farm, India

David Huggins

饰：自己

丹·巴伯尔

Dan Barber

饰：自己

Ignacio Chapela

Ignacio Chapela

饰：Self - Narrator, Interviewee, Microbial Ecologist and Associate Professor, University of California, Berkeley

Vandana Shiva

饰：Self - Physicist and Environmental Activist

David R. Montgomery

饰：Self - Professor of Earth and Space Sciences, University of Washington

Helmy Abouleish

饰：Self - Managing Director of the Sekem Initiative

Bob Cannard

饰：Self - Farmer, Cannard Farms, Sonoma, CA

Hans R. Herren

饰：Self - Co-Chair of the International Assessment of Agricultural Knowledge, Science and Technology for Development

Patrick Holden

饰：Self - Farmer, Former Director of the Soil Association, United Kingdom 1995-2010

Satish Kumar

饰：Self - Editor of Resurgence Magazine and Program Director of Schumacher College

David Pimentel

饰：Self - Professor of Ecology and Agricultural Sciences, Cornell University

Rajendra Singh

Rajendra Singh

饰：Self - Water Conservationist and Founder of Tarun Bharat Sangh, Rajasthan, India

Umendra Dutt

饰：Self - Executive Director, Kheti Virasat Mission

Rob Hopkins

饰：Self - Founder of Transition Town Totnes and the Transition Network

Surinder Kaur

Surinder Kaur

饰：Self - Natural Farmer, Kheti Virasat Mission, Punjab, India

Klaas Martens

饰：Self - Organic Farmer, Martens' Farm, Penn Yan, NY