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- 4,300 Tufts-owned computers X 0.12 kW X 250 workdays X 8 hours = The university uses 1,032,000 kWh per year to run all of Tufts computers just during business hours.
- This amounts to: 1,032,000 kWh X 11 cents = $113,500 per year in electricity costs.
- Greenhouse gas emissions for this electricity amount to: 1,032,000 kWh X 1.45 lbs of CO2 per kWh / 2,000 = 748 tons of CO2 per year.
- 100,000 - 500,000 trees are needed to offset these yearly emissions of CO2.
(A tree absorbs between 3-15 lbs of CO2 per year.)
- If 500 of these computers (which is only one in nine) are left on all the time this adds:
- 500 computers X 120 Watts X 365 days X 16 additional hours = 350,400 kWh
- $38,544 in electricity costs
- 254 tons of CO2
- It would take 34,000 – 169,000 trees to offset the same amount of CO2.
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