The 411 buildings owned by the city of Chicago will run entirely on renewable energy beginning Jan. 1. The feat will eliminate 290,000 metric tons of carbon dioxide emissions annually, according to Angela Tovar, the city’s chief sustainability officer. That’s equivalent to taking over 67,500 passenger vehicles off the road each year. “Every Chicagoan interacts with a city-owned building, whether the cultural center, City Hall, Harold Washington Library, O’Hare and Midway (international airports) or your local library.