Calling a product "green" can mean that it fits into any of a variety of categories. Primarily, a green product is more eco-friendly than its conventional alternative (i.e. a compact fluorescent light bulb, pictured, is more energy efficient than a regular bulb). A product also may be considered green if it has been made using more environmentally conscious practices, like organic food vs. non-organic food. Another factor that would make a product green would be creating it from something else, or reusing it. An example of this would be jewelry made from old glass bottles, or shoes made from tire rubber. It is a very broad category; there are many more characteristics that can make a product green. See also recycled products and organic products. (Photo: Flickr)