Trees are all-mighty recyclers. They regulate our air quality through photosynthesis, absorbing nearly a ton of CO2 in a lifetime and produce about 260 pounds of oxygen a year. Now they are being used to recycle waste. Willow trees are used in Sweden, to clean sewage sludge, reuse waste water, and recycle liquid from landfills. The town spreads its waste around the trees, which, in turn, decompose and recycle it. Trees can also have an impact on the energy used for heating and cooling a building, reducing air conditioning costs by as much as 30 percent and saving 20 to 50 percent on energy for heating. This is because as well as providing shade, a large tree can also transpire as much as 378.5 liters (100 gallons) of water into the air per day. This has a cooling effect roughly equivalent to 10 single room-sized air conditioning units operating 20 hours a day!
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