A power-generating windmill turbine is seen in front of the Arc de Triomphe on the Champs Elysees avenue in Paris ahead of the COP21 World Climate Summit, France, November 25, 2015. The upcoming conference of the 2015 United Nations Framework Convention on Climate Change (COP21) will start on November 30, 2015 at Le Bourget near the French capital.   REUTERS/Christian Hartmann  TPX IMAGES OF THE DAY - RTX1VSKI