Steffen, Jamais Cascio, and Jon Lebkowsky, along with some other frequent contributors to Sterling's Viridian notes, formed the Worldchanging blog.
Worldchanging was overseen by a board of directors, lead by Worldchanging's chairman, the environmental photographer Edward Burtynsky.
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Wired columnist Bruce Sterling called Worldchanging "the most important website on the planet," and architect Richard Meier named it as his favorite site and praised it as "a wealth of information on sustainability".
In November 2006, Steffen published a survey of global innovation, Worldchanging: A User's Guide for the 21st century (ISBN 978-0810930957) with a foreword by Al Gore, design by Stefan Sagmeister and an introduction by Bruce Sterling.