[dogma1138]

Not really, I don't like cycling in the city (not secure enough about not being plastered by a truck, especially considering how little fuck UK drivers seem to give) so I walk to work for almost 2 years now.

I started because I wanted to lose like 8-10lbs during a time when I couldn't exercise regularly at the gym which were lost within about 6 weeks.

I walk fast at about 6KM(my gait isn't very long because I wear either jeans or dress pants and I am of average height, but still I'm doing 130-135 steps per minute) an hour according to Google Fit/Apple Health, and I walk between 11-15KM a day (~2-2.5 hours I take a longer route through Hyde Park if the weather is nice and I'm not in a rush getting to or from work).

This daily walk alone increased my daily rough caloric requirement to about 2800-3000 calories, that's 600-800 (k)calories over my daily default if i don't do any physical activity other than getting up and commuting to work on the tube. If i don't increase my caloric intake i would lose between 0.5 and 1 KG a week so in this case and in every other case the "food expenditure" isn't a sunk cost, now you might say that my caloric intake doesn't have much impact on the grand scheme and you would be correct, if I need to eat another slice of pizza or another muffin it doesn't affect anything in the long run, if anything it probably means we might "waste" a bit less food. But given the current cost of each food calorie that you intake if everyone all of a sudden goes up to 3000 Kcal daily requirement it will have an effect on the environment and the economy.

What you should take from it is not that walking is bad for the environment but is that the global food production is highly inefficient ATM, food is cheap especially in the US but it comes at a pretty big price also.