What Pope Francis has set down in this Encyclical is not perfect; as some have already pointed out it leaves out the idea that an ever-expanding global population is ecologically unsustainable even with greater care of the planet. However it is a a more far-reaching statement about the connection between the health of the planet and the health of humanity than I have ever known to have be written by any religious leader of comparable authority. Yes, it is a religious treatise but it is also an environmental one and even – as he draws heavily upon biology, chemistry, ecology, and climatology – a scientific one.