They're pretty much the same, as neither need any fuel and don't have any emissions.
If you're really strict, walking is a little bit better because less energy is needed to make the shoes than to make the bike.
OTOH, maybe you can use the bike instead of the car for some trips, which would make the bike better.
Riding a bike, walking.
No, actually riding a bike does not harm the environment. When you ride a bike you do not emit any exhaust fumes. Which means your not helping to deplete the ozone.
Walking or just simply riding a bike
kids went to school by riding a bike and walking.
Walking, riding your bike or you could buy a stationary bike. for me riding my bike helps me to stay in shape it could help you to
riding a bike can have an advantage over a plane because if you don't want to pay money than a bike is better and that riding a bike gives you cardio.
Doing various types of squats, walking, and riding a bike
Do you mean transportation? Riding a bike or walking is a good way of transportation.
riding a bike
riding a bike and walking
Yes there are always alternate methods. There is walking the bus and bike riding.
hahahaha well theres walking, bike riding and all kinds of stuff there