Pope Francis already has a reputation for barnstorming. His positions on poverty, on gay priests, and liberation theology would have been shocking enough on their own, but in contrast to the more conservative positions of previous popes, they were downright lefty.
Sure, Francis has his more traditional moments. Abortion and assisted suicide are still no-go for the leader of the world's Catholics. But Francis has been explicit about links between capitalism, materialism, and threats to the world's poor. There's a reason he named himself after St. Francis of Assisi—famously poor, famously eco-conscious—after all.
Now the Pope is taking on science. Specifically, in a new encyclical—that's a letter laying out official Catholic doctrine—Francis describes Earth's problem with an increasingly messed-up climate, why that's the purview of religion, and who will suffer the most if people don't do anything about it. The encyclical, "On Care for Our Common Home," makes explicit the connection between climate change and oppression of the poorest and most vulnerable. It's well-argued, clear, at times quite moving…and 42,000 words long. So here's the good-parts version…