A residential system uses 61.64 GJ of electricity per year for cooling during summer, in the absence of any trees around the house. If shading trees were present, they would reduce electricity consumption by decreasing the cooling load to 60.10 GJ. The price of electricity is 8 cents/kWh. The initial cost of planting the trees is $200. How many years will it take for the cost and benefits of trees to break even? You may use discount factors of 0 percent and 3 percent.

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Table 16.6 Ecosystem services from trees on the refinery site. Abbr. Benefit description Quantity removed CO 21.04 kg NO₂ 03 PM2.5 SO₂ PM10 CO₂seq CO₂stor Carbon monoxide removed annually Nitrogen dioxide removed annually Ozone removed annually Particulate matter less than 2.5 microns removed annually Sulfur dioxide removed annually Particulate matter less than 10 microns removed annually Carbon dioxide sequestered annually in trees Carbon dioxide stored in trees (note that this is not an annual rate) 98.24 kg 1.18 t 45.13 kg 64.69 kg 334.25 kg 273.33 t 5.71 kt Monetary value of removal 0.084 $/kg 0.033 $/kg 0.033 $/t 6.25 $/kg 0.0066 $/kg 0.375 $/kg 39 $/t 39 $/t