The Arc de Triomphe is lit in green in Paris, France on Nov. 4, 2016 to celebrate the entry into force of the Paris Agreement on climate change. (Xinhua/Han Qian)
The Arc de Triomphe is lit in green in Paris, France on Nov. 4, 2016 to celebrate the entry into force of the Paris Agreement on climate change. (Xinhua/Han Qian)