National Geographic's Green Guide: Plastics

To make sure that your plastic water bottles and storage (food or other) containers are safe for your family and the environment, check their plastic type. On their bottom, you'll see a number inside a triangle pressed into the plastic. 3, 6, and 7 are considered plastics to avoid. Between probable cancer-causing properties and hormone disruptors, you'll want to turn these plastics in for recycling and replace with safer ones. ...read more at National Geographic's TheGreenGuide.com