Novak Djokovic of Serbia arrives for his tennis match against Stan Wawrinka

Djokovic of Serbia arrives for his tennis match against Wawrinka of Switzerland at the ATP World Tour finals at the O2 Arena in London

Novak Djokovic of Serbia arrives for his tennis match against Stan Wawrinka of Switzerland at the ATP World Tour finals at the O2 Arena in London.

Advertisements

Supporters of Turkish soccer club Besiktas light flares during the Europa League

635497366549741939-AFP-534693752

Supporters of Turkish soccer club Besiktas light flares during the UEFA Europa League Group C match in Belgrade, Serbia.

United Nations Secretary General Ban Ki-Moon speaks at the climate summit

1411477342000-un092314x0001

United Nations Secretary General Ban Ki-Moon speaks at the climate summit. The secretary general is attempting to push global action on climate issues before the opening of debate by the U.N. general assembly.