Oh and it turns out the carbon footprint for beef varies significantly by where the beef is raised. Average carbon footprint per 1kg of beef in the EU is 22.1 kg CO₂e [1], so if you're in the EU your beef-fueled 1 mile walk emits ~730g of CO₂e, a little under twice what you'd have emitted if you drove
If I'm reading this right it's not quite apples for apples, as it's comparing the cost to create and move the beef, but doesn't consider the cost to create the car, only the movement of the car.
A car driver could easily eat the same amount of food as a walker, the extra calories would be stored as fat. This also ignores upfront CO2 output from assembling and delivering the car and increased CO2 output from maintaining car infrastructure vs. pedestrian infrastructure. Not to mention numerous other externalities.
Here's what I found: the formula given in the article is "calories burned = BMR x METs/24 x hour"
But the METs for lying quietly is 1. The author certainly forgot to subtract 1 from METs in that equation, and could easily have also forgotten to do so when calculating the given numbers.
It just wouldn't make any sense to tell people "you burn X calories when walking/running/whatever for an hour" if they had to subtract their base metabolic rate from the number.
There are 340kcal in 100g of wholemeal wheat flour[2], so walking one mile takes around 21g of wheat
Wheat flour creates carbon emissions of 0.80 kg CO₂e/kg [3], so walking one mile creates carbon emissions of 170 g CO₂e
Driving a vehicle powered by gasoline produces tailpipe emissions of around 400g per mile [4]
[1] https://www.healthline.com/health/calories-burned-walking#Wa... [2] https://knowledge4policy.ec.europa.eu/health-promotion-knowl... [3] https://apps.carboncloud.com/climatehub/product-reports/id/9... [4] https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-t...