An aerial view shows the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, November 1, 2015. Loos-en-Gohelle, a town of 7000 inhabitants in the North of France, marked by the closure of coal mines in 1970, has demonstrated a successful transition from coal to a green economy. The city has joined the network of French positive energy territories, with almost 350 direct and indirect jobs created around the eco-activities and renewable energy in 10 years. On December 3, 2015, the Nord-Pas-de-Calais region will propose a visit of Loos-en-Gohelle as a symbol of a 'sustainable energy city'. This event will be part of the COP21, the World Climate Summit hosted by Paris from November 30 to December 11, 2015. (Photo by Pascal Rossignol/Reuters)





An aerial view shows solar panels of the experimental photovoltaic power plant LumiWatt at the foot of the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, November 1, 2015. (Photo by Pascal Rossignol/Reuters)





Solar panels of the experimental photovoltaic power plant LumiWatt are seen at the foot of the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A cyclist climbs one of the twin slag heaps at the site of the 11/19 former coal mine in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





Houses with roofs covered with solar panels are seen near the 11/19 pit and twin slag heaps (rear) at the former coal mine site in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





A view shows the mining engineer's house which was eco-renovated with insulating materials and high energy performance in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





A view shows an energy economies counter of a photovoltaic solar power installation on the wall of a church in Loos-en-Gohelle, northern France November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A view shows an energy economies counter of a photovoltaic solar power installation on the wall of a church in Loos-en-Gohelle, northern France November 1, 2015. (Photo by Pascal Rossignol/Reuters)





Hikers are seen on the path of the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, October 31, 2015. (Photo by Pascal Rossignol/Reuters)





A view from one of the twin slag heaps at the site of the 11/19 former coal mine in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





A view shows the old mine headframe at the site of the 11/19 former coal mine in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





Two hikers stand at the top of one of the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, October 31, 2015. (Photo by Pascal Rossignol/Reuters)





An aerial view shows the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A hiker is seen on the road of the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, October 31, 2015. (Photo by Pascal Rossignol/Reuters)





A city road sign is seen with the 11/19 pit and twin slag heaps of the former coal mine site in the background in Loos-en-Gohelle, northern France November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A shared flower and vegetable garden is seen in the city center in Loos-en-Gohelle, northern France November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A resident holds carrots harvested in a shared flower and vegetable garden installed in the city center in Loos-en-Gohelle, northern France November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A house of the VillAvenir project, one of the experimental houses with high energy performance, is seen in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





Solar panels of a photovoltaic solar power installation are seen on the roof of a church in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





A panoramic view from one of the twin slag heaps at the site of the 11/19 former coal mine in Loos-en-Gohelle, northern France October 31, 2015. (Photo by Pascal Rossignol/Reuters)





An aerial view shows solar panels (R) of the experimental photovoltaic power plant LumiWatt at the foot of the 11/19 pit and twin slag heaps at the former coal mine site in Loos-en-Gohelle, northern France, November 1, 2015. (Photo by Pascal Rossignol/Reuters)





A shared flower and vegetable garden is seen in the city center in Loos-en-Gohelle, northern France November 1, 2015. (Photo by Pascal Rossignol/Reuters)