Anons argue in comments
this post was submitted on 23 Feb 2025
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Human beings literally exhale CO2. This makes me curious what the actual carbon efficiency is when using a calorie to CO2 analysis factoring in the carbon footprint of the diet needed to fuel said travel.
Because IIRC carnivores are only 10% efficient, so this feels like a complicated problem. And then of course the carbon footprint of the manufacturing of various methods of transport and break even points over what periods of time.
The only important carbon part is the carbon used in transporting and growing the food in the form of fuel. We're not releasing trapped carbon when we're eating food as the only way we would save carbon in that situation is if we grew the food and buried it. Worrying about raw energy efficiency gets nonsensical because soon you'll be factoring in the solar energy conversion efficiency between growing and eating plants vs growing and burying plants to turn them into oil.
The better point is just that a bicycle is an incredibly efficient machine for moving a person in terms of energy input to work done compared to the hunks of metal cars are.
Well the meat industry is a large source of emissions isn't it? So if our meat consumption increased due to increased caloric intake, that should have a carbon impact right?
Sure but if you're using anything but carbs and fats to power exercise you're doing it wrong.
Plenty of people do everything wrong all the time. Hungry is hungry and people aren't going to necessarily change they eating habits if they worked up an appetite biking. They may even eat poorly specifically because they feel they earned it because they exercised.