AP Photo
The Generali balloon, which measures air quality flies behind the Eiffel Tower in Paris, Tuesday, Nov. 14, 2017. The COP 23 Fiji UN Climate Change Conference is taking place in Bonn, Germany. The US is participating in the talks, but experts say the U.S. position and President Donald Trump's comments could weaken efforts to curb global warming.(AP Photo/Christophe Ena)