Walk or Take Bus?

Every Friday, I need go to Central to work from Kensington. According to the google map, the distance from my living place to Central are around 1km. I can take bus or go to my office on foot. From the view of the cost, it takes me around AUD $3.5 per trip by bus while zero cost for walk to Central. For the time cost, it takes me around 20 min by bus while it takes 64 minutes for walk to Central.

For the carbon dioxide emission,  walking is more more less than taking the bus. For environmental saving, we should try to releases GHG as we can. Walking is good for healthy also. Therefore, i suggest than if possible, try arrive the dentation by using our whole foot.

Reference:
http://www.climatechangeauthority.gov.au/reviews/light-vehicle-emissions-standards-australia/opportunities-reduce-light-vehicle-emissions
http://www.globe.gov/explore-science/scientists-blog/archived-posts/sciblog/index.html_p=186.html