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

President Donald J. Trump’s executive order to repeal key policies meant to curb global warming is a direct contradiction of Catholic social teaching on caring for the environment.

Solutions should focus more on correcting unjust systems and selfish behaviors than population control.

Pope Francis praised the 100 countries that joined the Paris climate agreement but emphasized that implementing it must involve multidisciplinary cooperation and special measures of solidarity with the poor.

Researchers say deforestation, pollution, overfishing and the illegal wildlife trade, together with climate change, “are pushing species populations to the edge.”