Greenhouse gas emissions will be cut by up to 38% and will also save $4.4 million (£3 million) a year.The majority of the work should be finished within two years and carbon dioxide emissions will be reduced by 105,000 metric tonnes over the coming 15 years, which is equal to the annual emissions of 17,500 cars! The 102-storey building's 6,500 windows will be fitted with special insulated glass to reduce the summer heat and help to prevent heat loss in winter. Radiators will be insulated and more efficient air conditioning, heating and lighting systems will also be installed. The Art Deco Empire State Building is classed as one of the seven modern wonders of the world, the building was completed in 1931 and stands a quarter of a mile high. This project is hoped to encourage other buildings around the world to also go green.