4 ms·

You can disagree all you want. You’re still wrong. 100km on a bike is 2000kcal. Back of the envelope maths on a 65mpg car puts it at 35,000kcal.

dheera 4y ago
The original intent of my parent comment is: - 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 https://ourworldindata.org/grapher/ghg-kcal-poore [2] https://natural-resources.canada.ca/sites/www.nrcan.gc.ca/files/oee/pdf/transportation/fuel-efficient-technologies/autosmart_factsheet_6_e.pdf https://natural-resources.canada.ca/sites/www.nrcan.gc.ca/fi...
- twobitshifter 4y ago
  On the beef numbers, Australia and NZ now have net zero farms, so it may depend on where you live.
- scott_w 4y ago
  > - 35000kcal from gasoline emits how much CO2? 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.
  - dheera 4y ago
    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.
    - scott_w 4y ago
      Using your own sources, it doesn’t matter anyway https://news.ycombinator.com/item?id=35360988 https://news.ycombinator.com/item?id=35360988

dheera 4y ago

The original intent of my parent comment is: - 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 https://ourworldindata.org/grapher/ghg-kcal-poore [2] https://natural-resources.canada.ca/sites/www.nrcan.gc.ca/files/oee/pdf/transportation/fuel-efficient-technologies/autosmart_factsheet_6_e.pdf https://natural-resources.canada.ca/sites/www.nrcan.gc.ca/fi...

twobitshifter 4y ago
On the beef numbers, Australia and NZ now have net zero farms, so it may depend on where you live.
scott_w 4y ago
> - 35000kcal from gasoline emits how much CO2? 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.
- dheera 4y ago
  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.
  - scott_w 4y ago
    Using your own sources, it doesn’t matter anyway https://news.ycombinator.com/item?id=35360988 https://news.ycombinator.com/item?id=35360988