According to Gidon Eschel and Pamela A. Martin of the University of Chicago, a person with a red meat diet emits the global warming equivalent of 2.52 tons of CO2 a year more than a person with a vegetarian diet. For each day a week you eat on a vegetarian diet, you save 718 lbs of CO2 a year. It is assumed that the portion of animal-based calories in the diet is 26%.
Savings: 2 pounds per day
Source: geosci.uchicago.edu

The average meal in the United States travels 1,200 miles from the farm to your plate. The average local meal travels 200 miles. If a truck travels just 10 miles per gallon of gasoline, it requires 100 gallons of fuel to transport food the excess distance. For every gallon of gasoline consumed, 20 pounds of carbon dioxide are released into the atmosphere.
Savings: 666 pounds per day
Source: climatecrisis.org

For every day of the week that you eat only organically produced food, you save 572 pounds of CO2 from being emitted each year.
Savings: 1.5 pounds per day
Source: stopglobalwarming.org

Recycling 100% of your aluminum and steel cans can reduce your annual CO2 emissions by 166 pounds. This calculation assumes a 100% recycling rate and average waste generation; it also takes into account the CO2 produced throughout the metal's lifecycle.
Savings: 166 lbs per year, 14 lbs a month, 3.4 lbs a week
Source: epa.gov

If every Starbucks customer used a re-usable coffee cup or thermos, we could save 1,181,600 tons of wood, 2,040,061,237 pounds of carbon dioxide, and 4,441,093,624 gallons of water every year. That’s more carbon dioxide than would be emitted if the entire population of San Francisco got in their cars and drove from San Francisco to New York.
Savings: 1.25 lbs for five days, .25 lbs per day
Source: stanford.edu

Switch to public transport: Light rail will save a whopping 1,366 lbs. for an average 12-mile commute, but your standard city bus will trim 804 lbs. Heavy rail subway systems aren't as efficient, cutting 288 lbs. for the same commute. This calculation takes the average of these savings (819 lbs annually).
Savings: 2.2 lbs per day
Source: thegreenguide.com

Keeping optimum pressure in car tires reduces CO2 emissions by an average of 327 pounds a year. This calculation assumes that the average car is driven 12,000 miles a year and has a fuel efficiency of 22 mpg; an average of 20 pounds of CO2 are produced per gallon of gasoline consumed; and, CO2 emissions from driving are reduced by 3% as a result of keeping tires properly inflated.
Savings: 327 lbs per year, 27 lbs per month
Source: climatecrisis.org

You can save 800 lbs of carbon dioxide and $130 per year if you check your car’s air filter monthly and replace it if it looks dirty.
Savings: 67 pounds a month
Source: stopglobalwarming.org

Air travel is one of the fastest-growing contributors to global warming. A recent report from the Tyndall Centre for Climate Change Research notes that if the UK's annual 12 percent rise in air travel continues until 2050, the resulting increase in carbon dioxide would overwhelm progress in every other sector. (http://www.tyndall.ac.uk/)
Savings: 205 lbs per trip
Source: thegreenguide.com

This promise assumes that the contributor lives in the same location for at least a year.
Savings: 100 lbs annually per bulb
Source: stopglobalwarming.org

Run your dishwasher only with a full load. Save 100 lbs. of carbon dioxide annually.
Savings: 2 lbs per week
Source: stopglobalwarming.org

Savings: 250 lbs per year, 0.7 lbs per day
Source: stopglobalwarming.org

If you are able to take 2 minutes off of your daily hot shower then you can save 342 lbs. of carbon per year. Assumes an average hot showering time of 8 minutes.
Savings: 0.94 lbs. per day
Source: thegreenguide.com

Adjusting your thermostat down in the winter or up in the summer will reduce CO2 emissions by 500 pounds a year for each degree.
Savings: 500 lbs per year per degree, 42 pounds per month
Source: climatecrisis.org

By washing clothes in cold water instead of hot, 500 pounds of CO2 can be saved each year. Assumes 2 loads of wash completed each week.
Savings: 10 pounds per week
Source: enviroliteracy.org

Line-drying just half your laundry will save 723 lbs of carbon. Eliminating the dryer completely could save 1,446 lbs per year.
Savings: Save 28 lbs weekly for total elimination of dryer; 14 lbs weekly for partial elimination
Source: thegreenguide.com

If you do not have a TV in your home you can save approximately 2,700 pounds of CO2 from being produced. This calculation assumes a 9-year lifespan for a TV and that the average TV in the United States is on for 5.5 hours a day. Also assumed is that 1.6 pounds of carbon dioxide are emitted for every kWh of energy consumed.
Savings: 300 pounds per year
Source: energystar.gov

If you turn your hot water heater down to 120 degrees you can save 8,250 pounds of CO2 over its 15-year lifespan, or 550 pounds per year. Only annual savings are recognized here due to the tendency of people to move residences frequently.
Savings: 550 pounds per year
Source: climatecrisis.org

If you wrap your hot water heater in an insulating blanket you can save 15,000 pounds of CO2 from being produced over is 15-year lifespan, or 1000 pounds per year. Only annual savings are recognized here due to the tendency of people to move residences frequently.
Savings: 1,000 pounds per year
Source: climatecrisis.org

If every American household chose paperless, electronic bills, it could reduce solid waste in U.S. landfills by more than 800,000 tons a year; help curb the release of greenhouse gases (CO2) by 2.1 million tons a year; and could save an estimated 18.5 million trees a year!
Savings: 37 pounds annually
Source: ebillplace.com

By weight, paper products comprise nearly one-third of all waste going into landfills. Bulk mail, a substantial chunk of our paper waste, is especially troubling because it is often unsolicited and thus leaves citizens to dispose of materials they did not choose to consume. Catalogs and other direct mailings account for 5.2 million tons of waste each year and are recycled at a paltry rate of 19%, leaving over 4 million tons to clog landfills. That's 340,000 garbage trucks filled to the brim with nothing but bulk mail!
Gather all of the catalogs you get in the mail each month and take a few minutes to cancel the ones you never look at. All you need to do is call the customer service number and read a representative your customer number, which is on the back cover over the address label. If you cancel five catalogs, you can decrease your carbon output by about 77 pounds annually.
Savings: 77 lbs per year for 5 catalogues, 15.4 pounds per year for 1 catalogue
Source: newdream.org

Switching to using only 100% post consumer recycled paper reduces CO2 emissions by 288 pounds per year. This calculation assumes that the average per capita paper consumption in the United States is 273 pounds per year and that one ton of paper with a post consumer recycled content of 100% emits 2,108 less pounds of CO2 equivalent than non-recycled paper.
Savings: 288 lbs per year
Source: Environmental impact estimates were made using the Environmental Defense Paper Calculator. papercalculator.org

For every pound of paper that is recycled, CO2 emissions are reduced by 4 pounds. This calculation assumes a yearly per capita paper consumption of 273 pounds and a 100% recycling rate.
Savings: 273 lbs per year, 23 lbs a month, 5.6 lbs weekly
Source: enviroliteracy.org

Recycling 100% of your newspaper waste can reduce your annual CO2 emissions by 184 pounds. This calculation assumes a 100% newspaper recycling rate and average waste generation; it also takes into account the CO2 produced throughout the paper's lifecycle.
Savings: 184 lbs per year, 15 lbs monthly, 3.8 lbs weekly
Source: epa.gov

Use cloth bags to carry heavy groceries. Both San Francisco (US) and Leaf Rapids (Canada) have banned the use of plastic grocery bags. By cutting 100 million plastic bags a year the city of San Francisco will save 1.5 million liters of oil, and offset 4.2 million kilograms of carbon dioxide. More information here: cbc.ca
Savings: 1.4 lbs per month, 17 lbs per year
Source: climatecrisis.org

This calculation assumes that the computer remains off for a minimum of 10 hours a day. Calculation is for a desktop computer with a 17" monitor. Also assumed is that 1.6 pounds of carbon dioxide are emitted for every kWh of energy consumed.
Savings: 10 lbs per week, 40 lbs per month, 750 lbs per year
Source: energystar.gov

Shut off your computer when not in use, and save 200 lbs of C02 annually. Conserve energy by using your computer's "sleep mode" instead of a screensaver.

How to change your sleep-mode settings:
Windows
Apple
Savings: .55 lbs daily, 3.8 lbs weekly, 15 lbs monthly
Source: stopglobalwarming.org

Even when electronic devices are turned off, they use energy. Save over 1,000 lbs of carbon dioxide by unplugging un-used appliances. Your employer could save up to $256 per year.
Savings: 2.7 lbs per day, 13.7 lbs for a 5-day workweek, 55 lbs per month
Source: stopglobalwarming.org