The paperback edition of Worldchanging: A User's Guide for the 21st Century is on sale for a limited time at Amazon.com. Our best-selling book is now only $7.98 (that's 60 percent off the original cover price).

So, if anyone's been waiting for a chance to pick up a copy, now's the perfect time.

Worldchanging: A User's Guide for the 21st Century is a groundbreaking compendium of the most innovative solutions, ideas and inventions emerging today for building a sustainable, livable, prosperous future.

But you don't have to take our word for it. Check out what others are saying:

"To build that future, we need a generation of everyday heroes, people who – whatever their walks of life – have the courage to think in fresh ways and to act to meet this planetary crisis head-on. This book belongs in the library of every person who aspires to be part of that generation."
– Al Gore

"The Whole Earth Catalog retooled for the iPod generation ... [Their book] is a compendium of everything a younger generation of environmental activists has to offer: creativity, digital dexterity, networking ability, an Internet-era optimism about the future, and a deep concern about not only green issues but related questions of human rights, poverty, and social justice.
– Bill McKibben
New York Review of Books

"Reads like a smart, hip mini-encyclopedia of what's new and what's next in green technologies and earth-conscious ideas."
– Business Week

"Read it: it may change your life."
– Elizabeth Kolbert, New Yorker Writer

"The seminal resource guide for anyone concerned about today and the future."
– Laurie David, Global Warming Activist

"Worldchanging might well be the most complete, compelling articulation of the possible look and feel and actual operation of a sustainable society ever written."
– Denis Hayes, Earth Day Founder