![President Barack Obama walks with Pope Francis and First Lady Michelle Obama as he arrives at Joint Base Andrews, Maryland on September 22, 2015. The Pope is on a six-day, three-city visit President Barack Obama walks with Pope Francis and First Lady Michelle Obama as he arrives at Joint Base Andrews, Maryland on September 22, 2015. The Pope is on a six-day, three-city visit](https://c8.alamy.com/comp/W0J00P/president-barack-obama-walks-with-pope-francis-and-first-lady-michelle-obama-as-he-arrives-at-joint-base-andrews-maryland-on-september-22-2015-the-pope-is-on-a-six-day-three-city-visit-to-the-united-states-where-he-will-meet-with-president-obama-address-congress-and-hold-a-series-of-masses-photo-by-kevin-dietschupi-W0J00P.jpg)
President Barack Obama walks with Pope Francis and First Lady Michelle Obama as he arrives at Joint Base Andrews, Maryland on September 22, 2015. The Pope is on a six-day, three-city visit
![As Pope Francis Meets America, a Climate Science Scholar Offers a Fresh View of the Encyclical - The New York Times As Pope Francis Meets America, a Climate Science Scholar Offers a Fresh View of the Encyclical - The New York Times](https://static01.nyt.com/images/2015/09/24/us/23popeliveblog-balcony/23popeliveblog-balcony-facebookJumbo.jpg)
As Pope Francis Meets America, a Climate Science Scholar Offers a Fresh View of the Encyclical - The New York Times
![President Barack Obama walks with Pope Francis and First Lady Michelle Obama as he arrives at Joint Base Andrews, Maryland on September 22, 2015. The Pope is on a six-day, three-city visit President Barack Obama walks with Pope Francis and First Lady Michelle Obama as he arrives at Joint Base Andrews, Maryland on September 22, 2015. The Pope is on a six-day, three-city visit](https://c8.alamy.com/comp/W0J00R/president-barack-obama-walks-with-pope-francis-and-first-lady-michelle-obama-as-he-arrives-at-joint-base-andrews-maryland-on-september-22-2015-the-pope-is-on-a-six-day-three-city-visit-to-the-united-states-where-he-will-meet-with-president-obama-address-congress-and-hold-a-series-of-masses-photo-by-kevin-dietschupi-W0J00R.jpg)