Pope Francis isn’t letting up on his push for global action on climate change.

Barely a month after releasing a stern critique of capitalism and a call for nations around the world to reduce greenhouse gas emissions, the Vatican is hosting a high-profile meeting of world leaders this week to discuss two global crises it views as highly interconnected — climate change and modern slavery.

“Today we are facing two tragic emergencies that are related in different ways: the climate change crisis and the new forms of slavery,” the Pontifical Academy of Social Sciences said ahead of the two-day conference, which began today. “The religious leaders, called to condemn the new forms of slavery, have highlighted the connection between natural and human environment. As a matter of fact, global warming is one of the causes of poverty and forced migration, which are breeding grounds for human trafficking, forced labor, prostitution, and organ trafficking.”