Annual GHG Savings: 2,365 lbs of CO2
 carpool one day per month. 91 turn off my computer and monitor at the end of every day. 22 eat a zero waste lunch one day per week. 7 not eat beef one day per week. 336 only use two paper towels after washing my hands. 52 always use a reusable cup or glass. 27 recycle all paper waste. 1,799

## Commuting

To calculate how much carbon dioxide is saved by walking, biking, taking public transit, or working from home every day, this calculator assumes that the average one-way commute driving in a single-occupancy vehicle travels at an average of 40 miles per hour for 25 minutes or 16.67 miles in a car that has a fuel efficiency of 30 miles per gallon.

(16.67 miles / 30 miles per gallon) x 2 trips x 251 working days per year = 278.89 gallons of gas per year

According to the EPA, it takes 112.52 gallons of gas to produce one metric ton of carbon dioxide.

278.89 gallons of gas / 112.52 gallons of gas/metric ton CO2 x 2,204.623 lbs/metric ton = 5,464.3 lbs of CO2 per year

## ​Computers

To calculate the annual plug load for a computer and monitor in an office, this calculation assumes that the average computer and monitor have a combined plug load of 5 watts, that they are not in use on weekends or during the hours of 6pm and 6am during the week, and that there are 251 work days during the year.

((365 days x 24 hours) - (251 days x 12 hours)) x 5 watts / 1000 watts/kw = 28.74 kwh per year

According to the EPA, one kwh produces .000707 metric tons of carbon dioxide.

28.74 kwh x .00707 metric tons CO2/kwh x 2,204.623 lbs/metric ton = 44.8 lbs of CO2 per year

## ​Lunch Packaging

To calculate how much carbon dioxide is saved by using zero waste packaging instead of eating take-out meals for lunch, this calculation assumes that the average take-out meal contains one disposable #6 plastic fork or spoon, which weighs 2 grams, one disposable #7 plastic bowl with a lid, which weighs 27 grams, and one single-use #2 plastic bag, which weighs 0.5 grams. The average zero waste meal contains one steel fork or spoon, which weighs 30 grams, and one reusable #7 plastic container with a lid, which weighs 105 grams, each of which last for 2 years.

According to the EPA, for every 2,000 lbs of #6 plastic produced 2.5 metric tons of carbon dioxide are created, for every 2,000 lbs of #7 plastic produced 1.98 metric tons of carbon dioxide are created, for every 2,000 lbs of #2 plastic produced 1.57 metric tons of carbon dioxide are created, and for every 2,000 lbs of steel produced 3.67 metric tons of carbon dioxide are created.

(2 grams / 453.5924 grams per pound) x (2.5 metric tons CO2 / 2,000 lbs of #6 plastic) x 2,204.623 lbs/metric ton x 251 working days = 3.05 lbs of CO2
(27 grams / 453.5924 grams per pound) x (1.98 metric tons CO2 / 2,000 lbs of #7 plastic) x 2,204.623 lbs/metric ton x 251 working days = 32.61 lbs of CO2
(0.5 grams / 453.5924 grams per pound) x (1.57 metric tons CO2 / 2,000 lbs of #2 plastic) x 2,204.623 lbs/metric ton x 251 working days = 0.48 lbs of CO2

3.05 + 32.61 + 0.48 = 36.14 lbs of CO2 per year

1 reusable item per 2 years / 1 year = 0.5 reusable item per year
(30 grams / 453.5924 grams per pound) x (3.67 metric tons CO2 / 2,000 lbs of steel) x 2,204.623 lbs/metric ton x 0.5 years = 0.13 lbs of CO2 per year
(105 grams / 453.5924 grams per pound) x (1.98 metric tons CO2 / 2,000 lbs of #7 plastic) x 2,204.623 lbs/metric ton x 0.5 years = 0.25 lbs of CO2 per year

0.13 + 0.25 = 0.38 lbs of CO2 per year
36.14 - 0.38 = 35.76 lbs of CO2 per year

## ​Lunch Food

To calculate how much carbon dioxide is saved by eating vegan meals instead of meals with beef for lunch, this calculation assumes that lunch meal weighs on average 400 grams. The average meal with beef would contain 100 grams of beef, 100 grams of dairy, 100 grams of bread, and 100 grams of fruits and vegetables. The average vegan would would contain 100 grams of grains, 100 grams of bread, and 200 grams of fruits and vegetables.

According to the EPA, for every 2,000 lbs of beef produced 30.05 metric tons of carbon dioxide are emitted, for every 2,000 lbs of dairy produced 1.74 metric tons of carbon dioxide are emitted, for every 2,000 lbs of bread produced 0.67 metric tons of carbon dioxide are emitted, for every 2,000 lbs of grains produced 0.62 metric tons of carbon dioxide are emitted, and for every 2,000 lbs of fruits and vegetables produced 0.44 metric tons of carbon dioxide are emitted.

100 grams / 453.5924 grams per pound = 0.220462 lbs
30.05 metric tons CO2 / 2,000 lbs of beef x 0.220462 lbs of beef x 2,204.623 lbs/metric ton = 7.3 lbs of CO2
1.74 metric tons CO2 / 2,000 lbs of dairy x 0.220462 lbs of dairy x 2,204.623 lbs/metric ton = 0.42 lbs of CO2
0.67 metric tons CO2 / 2,000 lbs of bread x 0.220462 lbs of bread x 2,204.623 lbs/metric ton = 0.16 lbs of CO2
0.62 metric tons CO2 / 2,000 lbs of grains x 0.220462 lbs of grains x 2,204.623 lbs/metric ton = 0.15 lbs of CO2
0.44 metric tons CO2 / 2,000 lbs of fruits and vegetables x 0.220462 lbs of fruits and vegetables x 2,204.623 lbs/metric ton = 0.11

(7.3 + 0.42 + 0.16 + 0.11) x 251 working days = 2,005.49 lbs of CO2 per year
(0.16 + 0.15 + 0.11 + 0.11) x 251 working days = 133.03 lbs of CO2 per year
2,005.49 - 133.03 = 1,872.46 lbs of CO2 per year

## ​Drinks

This calculation assumes that the average person uses 2 disposable paper coffee cups per day, which weigh 10 grams each, and 2 disposable #1 plastic cups per day, which also weigh 10 grams each. This calculation assumes that the average reusable #7 plastic cup weighs 50 grams, the average reusable glass weighs 280 grams, the average reusable ceramic mug weighs 370 grams, the average reusable steel tumbler weighs 315 grams, and each lasts for 3 years.

According to the EPA, for every 2,000 lbs of general mixed paper produced 8.48 metric tons of carbon dioxide are emitted, for every 2,000 lbs of #1 plastic produced 2.24 metric tons of CO2 are emitted, for every 2,000 lbs of #7 plastic produced 1.98 metric tons of CO2 are emitted, for every 2,000 lbs of glass produced, 0.6 metric tons of CO2 are emitted, for every 2,000 lbs of ceramics produced 0.2701 metric tons of CO2 are emitted, and for every 2,000 lbs of steel produced 3.67 metric tons of CO2 are emitted.

2 cups per day x 251 working days = 502 disposable cups per year
1 cup per 3 years / 1 year = 0.33 reusable cups per year

Disposable cups:

10 grams / 453.5924 grams per pound x 502 cups per year = 11.067205 lbs per year
5 grams / 453.5924 grams per pound x 502 cups per year = 5.533602 lbs per year
8.48 metric tons CO2 / 2,000 lbs of general mixed paper x 11.067205 lbs per year x 2,204.623 lbs/metric ton = 107.84 lbs of CO2 per year
2.24 metric tons CO2 / 2,000 lbs of #1 plastic x 5.533602 lbs per year x 2,204.623 lbs/metric ton = 13.66 lbs of CO2 per year

Reusable Cups:

50 grams / 453.5924 grams per pound x 0.33 cups per year x (1.98 metric tons CO2 / 2,000 lbs of #7 plastic) x 2,204.623 lbs/metric ton = 0.08 lbs of CO2 per year
280 grams / 453.5924 grams per pound x 0.33 cups per year x (0.6 metric tons CO2 / 2,000 lbs of glass) x 2,204.623 lbs/metric ton = 0.14
(0.08 + 0.14) / 2 = 0.11

370 grams / 453.5924 grams per pound x 0.33 cups per year x (0.2701 metric tons CO2 / 2,000 lbs of ceramics) x 2,204.623 lbs/metric ton = 0.08
315 grams / 453.5924 grams per pound x 0.33 cups per year x (3.67 metric tons CO2 / 2,000 lbs of steel) x 2,204.623 lbs/metric ton = 0.94
(0.08 + 0.94) / 2 = 0.51

107.84 - 0.51 = 107.33
13.66 - 0.11 = 13.55
107.33 + 13.55 = 120.88 lbs of CO2 per year

## ​Paper Towels

This calculation assumes that the average person uses 3 sheets of paper towel each time they wash their hands, and wash their hands 4 times per day, so a pledge to use 1 paper towel each time they washed their hands would save 8 paper towels each day.

8 sheets per day x 251 working days = 2,008 sheets of paper towel per year

According to the EPA, for every 2,000 lbs of general mixed paper produced 8.48 metric tons of carbon dioxide are emitted. One sheet of paper towel weighs 2.5 grams.

2.5 grams / 453.5924 grams per pound = 0.005511556 lbs
8.48 metric tons of CO2 / 2,000 lbs of general mixed paper x 0.005511556 lbs x 2,008 paper towels reduced x 2,204.623 lbs/metric ton = 103.45 lbs of CO2

## ​Paper

To calculate the carbon savings from recycling reducing paper use by 50%, this calculation assumes that the average office worker uses 10,000 sheets of paper each year. According to the EPA, for every 2,000 lbs of office paper produced 8.25 metric tons of carbon dioxide are emitted. A box of 500 sheets of paper weighs 20 pounds.

500 sheets / 20 lbs = 25 sheets per pound
10,000 sheets / 25 sheets per pound = 400 lbs of paper
8.25 metric tons of CO2 / 2,000 lbs of paper = 0.004125 metric tons CO2 per pound of paper
0.004125 x 2,204.623 lbs/metric ton = 9.094 lbs of CO2 per pound of paper
9.094 x 400 lbs of paper x 50% = 1,818.81 lbs co2 per year.

According to the EPA, 2.86 metric tons of CO2 are saved for every 2,000 lbs of paper recycled, and 1.22 metric tons of CO2 are produced for every 2,000 lbs of paper landfilled.

2.86 metric tons of CO2 / 2,000 lbs of paper x 200 lbs of paper recycled = 0.286 mtco2
1.22 metric tons of CO2 / 2,000 lbs of paper x 400 lbs of paper = 0.244 mtco2
(0.286 + 0.244) x 2,204.623 lbs/metric ton = 1,168.45 lbs of CO2

1,168.45 + 1,818.81 = 2,987.26 lbs of CO2