Pope Francis condemned world leaders Thursday night for what he called "cowardice" for failing to defend the Earth's environment, and said the pursuit of money is behind this failure.

"Our common home is being pillaged, laid waste and harmed with impunity. Cowardice in defending it is a grave sin. We see with growing disappointment how one international summit after another takes place without any significant result," the pope said to a gathering of roughly 1,500 social organizers in Bolivia.

The pope also took a jab at modern capitalism. He called the "unfettered pursuit of money" the "dung of the devil," and said it's behind "all this pain, death and destruction" of the environment.

Francis spoke about the rights of the poor and on social justice, calling for them to rise up against "new colonialism" — corporations, for example — and "the monopolizing of the communications media."

The pope also apologized for the "many grave sins" committed by the Catholic Church against Native Americans "in the name of God."

The 78-year-old pontiff is from Buenos Aires, Argentina, which makes him the first Latin American pope. Bolivia is his second stop on his three-nation tour of Latin America's poorest countries.

(h/t CNN)