Johannes Lehmann is professor of soil biogeochemistry and soil fertility management at Cornell University, USA, Co-founder and Chair of the Board of the International Biochar Initiative, member of the U.S. Departments of Agriculture and Energy Biomass R&D committee and editor-in-chief of Nutrient Cycling in Agroecosystems Stephen Joseph is a visiting professor in the School of Materials Science and Engineering at the University of New South Wales, Australia, and Co-founder of the International Biochar Initiative.
'With its careful evaluation of every aspect of biochar, this book represents a cornerstone of our future global sustainability. I’m convinced that its message is every bit as important as that of Rachel Carson’s Silent Spring, and potentially every bit as politically powerful as Al Gore’s An Inconvenient Truth. If it finds a wide enough readership, it will change our world forever, and very much for the better.' Tim Flannery (Melbourne, August 2014).