<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54caf903b772f_-_city-co2-1012-de.jpg>
<http://www.popularmechanics.com/science/environment/a8147/seeing-a-city-co2-emissions-block-by-block-13852826/>