The Associated Press has learned that dozens of environmentally friendly mayors from around the world will be signing off on a Vatican declaration calling for their national leaders to approve a "bold climate agreement" that keeps global warming at a safe limit for humanity.

Some 60 mayors are attending a two-day climate conference at the Vatican featuring an audience with Pope Francis.

The final declaration expected to be signed Tuesday, a copy of which was seen by the AP, states that "human-induced climate change is a scientific reality and its effective control is a moral imperative for humanity."

The document calls for financial incentives to transition to low-carbon and renewable energy and shift public financing away from the military to "urgent investments" in sustainable development.