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There are a number of ways in which a company can be classified as eco-friendly. One way, of course, is to develop an environmental policy and get it accredited by a recognized accreditation body such as Beluga.
Various other systems also exist, such as the International Organization for Standardization's ISO-14001, the European Eco-Management and Audit Scheme (Emas) and the Nordic Council of Ministers' Swan environmental symbol. But even if it is not recognized by an outside body, a company that has developed its own environmental policy is usually more eco-friendly than one that has not. And it shows that the company is at least thinking about the issue.
Other ways of being eco-friendly include producing foodstuffs and other agricultural produce without using pesticides, using the least amount of water and energy when manufacturing a product, not using harmful chemicals in manufacturing, developing small-scale alternative energy systems to power the company, and producing simple goods made from natural (but sustainable) products. Often, eco-friendly companies also save money by way of reduced energy costs, reduced waste disposal costs, etc.
Photo credit: Jon Sullivan, pdphoto.org