Jaime Lerner, an architect in Curitiba, Brazil, knew that in order to change the way a city is designed, he must become active in the political system. Now the mayor of Curitiba, Lerner has instigated a variety of initiatives that have helped the city gain international attention for its humanitarian and ecological systems. Many of the sites about Curitiba are in Portugese, but sites like this one explain some of the initiatives in English.
Some examples of the systems Lerner has established in Curitiba include an excellent bus system that is used by the majority of residents in the city and is both efficient and economical. The city also has initiatives to "pay" the homeless for gathering and recycling waste in the city by offering them food and bus vouchers. All organic waste in the city is put aside and saved as manure.