MacEachern's most recent book is Big Green Purse. Another of her books, Save Our Planet, has been featured on national television programs including CNN Headline News, Live with Regis and Kathie Lee, and the ABC Earth Day Special, and have been reprinted in Italy and Japan. Beat High Gas Prices Now! received widespread media coverage as well.

BigGreenPurse.com, the website associated with her books, was named "2007 Best Green Website" by FutureNow. The site offers eco-lifestyle suggestions and shopping tips and promotes the One in a Million Pledge. The Pledge asks one million women to shift $1,000 of their household budgets to green products and services.

MacEachern wrote a nationally-syndicated Washington Post Writer's Group newspaper column, "Tips for Planet Earth," answering readers' questions on environmental topics. She has produced numerous publications for members of Congress, the media, and the public at large. Her writings have been featured in MoveOn's 50 Ways to Love Your Country and The Cousteau Almanac on the Environment, as well as Good Housekeeping, Family Circle, Self, Christian Science Monitor, Ladies Home Journal, Reader’s Digest, First for Women, Baltimore Sun, and Country Living.

MacEachern worked with the U.S. Environmental Protection Agency to educate the public about global warming. With the Southern Utah Wilderness Alliance, she also worked to establish the Grand Staircase/Escalante National Monument during the Clinton Administration.

A frequent speaker on women and the environment, MacEachern serves as the vice-chair of the board of directors for the Alaska Wilderness League. She has been called a trendsetter by the Sierra Club and has been cited for her Distinguished Service as a board member of the Center for Science in the Public Interest.

Diane lives with her husband and their two children in the energy-efficient home they helped build more than 20 years ago. She received her Master of Science Degree from the School of Natural Resources and Environment at the University of Michigan.