Pope Francis has demanded swift action to save "our home" from environmental ruin, saying the planet is "beginning to look more and more like an immense pile of filth".
The head of 1.2 billion Roman Catholics rounded on politicians for failing to show leadership on climate change, and blamed the rich as he said big business was "obsessed with maximising profits".
In a landmark encyclical he said there was a "solid scientific consensus" that mankind was at least mostly responsible for global warming.
The Pontiff warned of the "sin" of environmental destruction. The Pope wants a change in lifestyles to move away from a consumerist culture, which was making the earth "less rich and beautiful … even more limited and grey".