WE NEED GREEN-IDEAS

¿What can you do to change the environmental impact in our cities?
1) Think in a project and write your ideas in a piece of paper.
2) Ideas to use water, energy, materials, etc. in a better way.
Requirements:
1) Impact
2) Creativity
Categories:
1) Water
2) Others

Competition: http://www.pucp.edu.pe/brochure/premio/ecoeficiencia/docs/bases_2009.pdf
http://www.pucp.edu.pe/brochure/premio/ecoeficiencia/docs/presentacion.pdf
http://www.pucp.edu.pe/brochure/premio/ecoeficiencia/