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The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

The Paris skyline. The COP21 U.N. climate conference took place in the city in December 2015. Photo by Brian Kaylor.

A large public square in Paris, located at the site occupied in the 14th century by the stronghold of Charles V's Porte du Temple enclosure, honoring the French Revolution. It became a key memorial spot after the Nov. 13, 2015, terrorist attacks. Photo by Brian Kaylor.

A large public square in Paris, located at the site occupied in the 14th century by the stronghold of Charles V's Porte du Temple enclosure, honoring the French Revolution. It became a key memorial spot after the Nov. 13, 2015, terrorist attacks. Photo by Brian Kaylor.

The Eiffel Tower in the early evening. Photo by Brian Kaylor.

The Eiffel Tower in the early evening. Photo by Brian Kaylor.

A Paris street. Photo by Brian Kaylor.

A Paris street. Photo by Brian Kaylor.

Sainte-Chapelle (Holy Chapel), a royal medieval Gothic chapel, in the center of Paris. Photo by Brian Kaylor.

Sainte-Chapelle (Holy Chapel), a royal medieval Gothic chapel, in the center of Paris. Photo by Brian Kaylor.

Cathėdrale Notre Dame de Paris, site of a special Dec. 3 worship service during the COP21 climate conference. Photo by Brian Kaylor.

Cathėdrale Notre Dame de Paris, site of a special Dec. 3 worship service during the COP21 climate conference. Photo by Brian Kaylor.

Sainte-Chapelle (Holy Chapel), a royal medieval Gothic chapel, in the center of Paris. Photo by Brian Kaylor.

Sainte-Chapelle (Holy Chapel), a royal medieval Gothic chapel, in the center of Paris. Photo by Brian Kaylor.

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