Benedict has been called the “green pope” for his statements on climate change and environmental stewardship, which he typically casts as a call to remember the poor. Under his leadership, Vatican City installed photovoltaic panels in Nervi Hall, which can hold 10,000 people.

“The protection of the environment, and the safeguarding of resources and of the climate, oblige all leaders to act jointly,” he wrote in 2008.

In 2011, he called for international leaders to address climate change: “I hope that all members of the international community can agree on a responsible, credible and supportive response to this worrisome and complex phenomenon,” he said.

He's also been accused of equating environmental destruction with atheism. In 2009, he said “Is it not true that inconsiderate use of creation begins where God is marginalized or also where his existence is denied?