[tim333]

I'd dispute some of the reasoning with those - the first one is assuming the cyclist is fueling themselves with fruit, something quite expensive with limited calories rather than the real stuff people fuel up on like bread or potatoes.

[a_imho]

The math is indeed off in the tweet, as fruitarian should be 2.5x worse instead of 1.5.

I don't think the 5g/kcal is expensive according to the chart, it is a good average for omnivores, consider the biker being fueled by cheeseburgers on the other end of the spectrum. If you have a more efficient EV (smaller car, even scooter for commute), put in whole family instead of riding alone in a car, or have more efficient means to charge the EV like surplus renewables you can't store/use at home the difference is getting quite staggering. One could argue the manufacturing of the EV emits more co2 than manufacturing a bike and we should control for miles drive/rode during their lifecycle but if both are available using the EV is most probably the environmentally friendlier option. That said, I won't give up my bike either because I enjoy the exercise, but it is a lot less green than one would imagine without looking at the numbers.

[tim333]

Bread/potatoes are about 0.6g/kcal which would put the cyclist at ~30g/mile vs 100g for the car. Not that people live on that alone but with exercise you often have more potatoes with the steak etc.

I've been using an ebike which is one of the lowest emission things, and fun.

Someone here ran some numbers with bikes better than cars/busses including the cost of making them https://www.bikeradar.com/features/long-reads/cycling-enviro...