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, which begins Monday.
Christian Hartmann/Reuters /Landov
President Obama (center) and Secretary of State John Kerry (right) attend Monday's opening ceremony of the United Nations Climate Change Conference in the Paris suburb of Le Bourget.
Russia's Mariya Savinova won gold in the 800-meter final at the 2012 Olympics in London. A new report ruled that she should never should have competed because her drug test profile showed she was doping.