| Activity/Source | Average Energy (weight of CO2 emitted) | Efficient |
| Lighting | 900 kWhr (850 lbs CO2) | 450 kWhr (425 lbs) |
| Heating | 900 kWhr (754 gallons oil or 17,600 lbs CO2) | 350 kWhr (6500 lbs) |
| Cooling | 586 kWhr (531 lbs) | 391 kW (355 lbs) |
| Aquarium | 300 kWhr (288 lbs) | 250 kWhr (235 lbs) |
| Computer | 675 kWhr (630 lbs) | 464 kWhr (437 lbs) |
| Dryer | 1456 kWhr (1369 lbs) | 1310 kWhr (1232 lbs) |
| Washer | 137 kWhr (790 lbs) | 82 kWhr (520 lbs) |
| TV | 200 kWhr (188 lbs) | 150 kWhr (141 lbs) |
| Car | (20 mpg) 12,000 miles/yr (11,200 lbs CO2) | (28 mpg) 12,000 miles/yr (8500 lbs CO2) |
Average household (excluding cars): 9000 kWhr of electricity
+ 900 gallons of oil = 32,000 lbs CO2