The recycling of home appliances has become mandatory in some countries to keep them out of the waste stream. This is done to reduce or eliminate toxic substances from entering the wider environment and affecting ecosystems. The strength of appliance recycling legislation varies around the world. recycling one refrigerator can save 2,397/50,000 tons of CO2 a year, 3,912,750 btu's of energy, 1,739/105,600 tons of Al , 799 gallons of H2O , gain almost 10,387/40,000 tons of O per year equal to 799/400 trees