- 2000kcal from food = how much CO2 including all the energy needed to farm it?
If it's 2000kcal from beef, you're looking at about 72.88 kg [1]
If it's 2000kcal from fish, you're looking at about 15.21 kg [1]
If it's 2000kcal from brassicas, you're looking at about 6 kg [1]
- 35000kcal from gasoline emits how much CO2?
35000 kcal is 140440 kJ, which would consume about 4.36 liters of gasoline, which would be about 10 kg of CO2 emissions [2].
So the CO2 efficiency of a car isn't that much different, and falls somewhere in-between a biker on a fully meat and biker on a fully vegetable diet. Biking isn't vastly more efficient than a car, CO2-wise.
That said, a motorized bike is hellishly efficient, CO2-wise, and trumps almost everything else.
If you're going to do that, what about the CO2 (gasoline) emitted to collect the gasoline? Given you need oil to extract oil, it's still far, far, far less efficient.
It's miniscule compared to burning the gas, or the oil industry wouldn't exist, considering a lot of the oil extraction and refinement industry is powered by oil itself.
You could have also Googled that number instead of trying to make a comeback for the sake of it.
- 2000kcal from food = how much CO2 including all the energy needed to farm it?
If it's 2000kcal from beef, you're looking at about 72.88 kg [1]
If it's 2000kcal from fish, you're looking at about 15.21 kg [1]
If it's 2000kcal from brassicas, you're looking at about 6 kg [1]
- 35000kcal from gasoline emits how much CO2?
35000 kcal is 140440 kJ, which would consume about 4.36 liters of gasoline, which would be about 10 kg of CO2 emissions [2].
So the CO2 efficiency of a car isn't that much different, and falls somewhere in-between a biker on a fully meat and biker on a fully vegetable diet. Biking isn't vastly more efficient than a car, CO2-wise.
That said, a motorized bike is hellishly efficient, CO2-wise, and trumps almost everything else.
[1] https://ourworldindata.org/grapher/ghg-kcal-poore
[2] https://natural-resources.canada.ca/sites/www.nrcan.gc.ca/fi...