A Panel shows the traffic Light a reading and a mapping system which gives each building of the Parliament complex a color code depending on the consumption of electricity, water and heat, stands in front of Slotsholmen in Copenhagen Denmark, May 24, 2012. Denmark renovates the heat supply in historical buildings with more energy efficiency technology, Slotsholmen is a complex of buildings that surrounds the danish Parliament. It is about 30 buildings which were previously heated with a 100 year old heating system. A new central heating was introduced last year.
