During a private dinner recently I was asked for the most environmentally friendly way to travel to work. I compared the data for cars, buses, trams on average European electricity and trains and finished by the conclusion that the bus is the most environmentally friendly way to go to work. This is supported both by carbon dioxide emissions and energy use. The lady next to me was however not satisfied with the answer and I had to include walking and biking in the discussion.
Reliable data for emissions and energy use for food productions is not easy to find. A global average is related to in the “Stern Report” but large local variations are to be expected. After some searching on the Internet I found a site that discussed the very same issue.
I was surprised to find such a very high energy use for food production in the US. The conclusion is, any way, that its even better to take the car than walking to work! Still, many of us, that can chose to go by different means, also needs some exercise and why not use the time and energy we need for exercise anyway to travel to work. And, both biking and walking combines very well with the most environmentally friendly efficient buss ride to work.