My favourite subject

The subject that I most enjoyed this semester is "Sostenibilidad Urbana" (Urban Sustainability). In this class the teacher explain the contents using PowePoint presentation and me (and other classmates) take notes during class.
The topics tackled in class are very interesting for me, we have learned about ecology, renewable energies, transport, and in the latest class we saw examples of good cities, that are role models of development, specifically we studying as the city government improved its transport system and as this transform the city in a sustainable city.

It is interesting for me because i considering very difficult plan the mode in that will function the city and as this form will be sustainable. Are many the variables that a urbanism architect have to consider in a desing of sustainable city: Main streets, commercial areas, green areas etc.

I remember that Copenhagen is a sustainable city, that after of Oil crisis strengthened the use of bike, since then the city built many bike path and currently a 62% of the Copenhagen population use the bike to go to work or school.