There are two components of flatulence that contribute to global warming: carbon dioxide and methane. Both are produced as a result of gut bacteria metabolizing complex carbohydrates (like fiber) that our upper digestive system is incapable of processing efficiently. There's a lot of diversity in the composition of the population of bacteria in people's guts; carbon dioxide producing bacteria are quite common, while methanogens (methane-producers) are pretty rare.
As farting habits are almost entirely dependent on diet and the composition of gut bacteria, it's very difficult to establish what a "standard" fart is like. Surprisingly, there have been a number of studies conducted to establish what the chemical composition of flatulence is, but I think the most useful one (being the connoisseur of fart articles that I am) is Investigation of normal flatus production in healthy volunteers. In this study, the authors analyzed the chemical composition of the farts of 10 volunteers when they were on a high fiber diet (normal diet supplemented with 200 grams of baked beans a day) and a no fiber diet.
The no fiber diet produced very little flatulence in the panel, while the high fiber diet produced varying amounts of both carbon dioxide and methane -- specifically, an average of 15 milliliters of methane a day, and a median of around 70 milliliters of carbon dioxide per day. That's about 10 milligrams of methane and 140 milligrams of carbon dioxide per day.
Assuming that these people and this diet are representative of the world population (not necessarily true, but close enough), human beings collectively release about 73 metric tons of methane and 1000 metric tons of carbon dioxide into the atmosphere every day just by farting.
This is a trivial amount of carbon dioxide -- roughly equivalent to 1000 people flying from New York to Los Angeles. Methane is about 20 times as potent of a greenhouse gas, so we can bump that up to 2000 people flying one way.
I'm so very sorry.
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