Most of the D2545 printer—about 85 percent of the plastic, even in its ink cartridges—is recycled. And the gray casing was created without chemical bleaches or dyes. HP Deskjet D2545 $50 (est.); hp.com
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.