Andrews McMeel Publishing · Hyperion
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| 50 Simple Things You Can Do to Save the Earth: All New! Updated for the 21st Century | 978-1-4013-2299-1 (1-4013-2299-9) | 2008 | John Javna · Jesse Javna |
| The New 50 Simple Things Kids Can Do to Save the Earth | 978-0-7407-7746-2 (0-7407-7746-7) | 2009 | EarthWorks Group |