Reversing any effort that reduces greenhouse gas pollution endangers the planet and puts the world's most vulnerable people at risk, the advocates said.

A tribal coalition, which considers many sites within Bears Ears sacred, fears the Trump administration will take the unprecedented step of stripping a national monument of its designation, and leave their ancestral lands vulnerable.

Climate change is already affecting vulnerable populations across the world, in places that are the least able to adapt.

Addressing 90 experts from many countries, Francis said that “all people have a right to safe drinking water.”

The Jesuits invite people of good will and members of Congress to call on the administration to reverse its decision the Dakota access pipeline.

“The grave danger," Pope Francis writes, "is to disown our neighbors. When we do so, we deny their humanity and our own humanity...and we deny the most important Commandments of Jesus.”