United States,  for each  man woman or child produces on the order of  120  pounds of CO2 per day.To be clear, I am saying the US produces nearly 500 pounds of CO2  for a family of 4, every single day, with no breaks for Christmas, Passover or Ramadan.  I use this measure, because gigatons, tons annually are numbers for which perspective is difficult. Pretty easy to understand in measurements we all use day in and day out. Pounds per person per day, is a number which I have personally seen hardened (non-professional) deniers blink at- because it’s objectively ridiculous, without even the understanding of CO2’s warming effects on the earth. It’s like how compound interest might only be a dollar or two a day, but adds up  to a lot after awhile. Similarly 38 billion pounds of CO2 every day for decades eventually adds up to a lot. 120 pounds per person per day is what you get if you do the math on the EPA’s estimate of US greenhouse gas emissions, similarly to the math I do on the oil production number. However, it does not take into account imported content- US imports of goods which produce greenhouse gases in other places. Chat GPT estimates it below. There are other places where estimates are used and the results could be even more, https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions The most certain number in this estimate  is the oil consumption number- because the oil companies, oil markets and the US government base prices on inventories and shipments. The kind of thing is  58 pounds per person per day. Being that it is a big source, but one of many (agriculture, buildings, power plants) it verifies the scale of the EPA’s numbers. (https://www.eia.gov/tools/faqs/faq.php?id=33&t=6) 2022 EIA (energy information administration) estimate of US oil consumption daily = 20.28 million barrels of oil per day  940 pounds CO2/ barrel 2020 US Census is 330 million Americans 20.3 million barrels of oil * 940 pounds CO2/ barrel   divided by 330 million Americans = 57.8 pounds of CO2 produced for every man, woman and child in the United States, every day, or 18 billion pounds per day every day of the year. It Chat GPT’s estimate, including the imported goods, comes out to be closer to 210 pounds per person per day. Sure, I can provide these estimates.  First, I will summarize the relevant estimates from my previous responses: - US domestic GHG emissions per person per day: 20.4 metric tons \/ 365 = 0.056 metric tons, or 56 kg CO2 Eq. - Imported-content-related GHG emissions per person per day (assuming 70% imported content and a GHG intensity factor of 9.4 kg CO2 Eq. per US dollar of imported goods): 0.039 metric tons, or 39 kg CO2 Eq. To get the total GHG emissions per person per day, we can simply add these two estimates: - Total GHG emissions per person per day: 0.056 + 0.039 = 0.095 metric tons, or 95 kg CO2 Eq. To convert this into pounds, we can use the conversion factor of 2.20462 pounds per kilogram: - Total GHG emissions per person per day: 209.44 pounds So, based on these estimates, the average US citizen is responsible for emitting around 209.44 pounds (95 kg) of GHGs per day.  Next, I will provide similar estimates for methane emissions. According to the EPA, methane has a global warming potential (GWP) of 28 over a 100-year time horizon, meaning that one unit of methane is equivalent to 28 units of CO2 in terms of its warming effect. The EPA estimates that in 2018, the US emitted around 679 million metric tons of CO2 Eq. from methane sources, or around 2,082,000 metric tons per day. If we convert this into methane-equivalent units, we get: - US domestic methane emissions per person per day: (2,082,000 \/ 328.2 million) \/ 28 = 0.027 metric tons, or 27 kg Using the same assumptions as before (i.e., 70% imported content and a GHG intensity factor of 9.4 kg CO2 Eq. per US dollar of imported goods), we can estimate the imported-content-related methane emissions per person per day as: - Imported-content-related methane emissions per person per day: 0.0183 metric tons, or 18.3 kg Adding these two estimates together, we get: - Total methane emissions per person per day: 0.027 + 0.0183 = 0.0453 metric tons, or 45.3 kg To convert into pounds, we use the same conversion factor: - Total methane emissions per person per day: 99.95 pounds So, based on these estimates, the average US citizen is responsible for emitting around 99.95 pounds (45.3 kg) of methane per day. In summary, the total GHG emissions per person per day for US citizens is estimated at around 95 kg (209.44 pounds), while the total methane emissions per person per day is estimated at around 45.3 kg (99.95 pounds). These estimates are based on several assumptions and approximations, so actual emissions may vary depending on various factors. Nonetheless, they can provide a rough idea of the scale and sources of GHG and methane emissions of the average US citizen.