It appears the Vatican City State has just become another European vassal state climbing aboard the Global Warming Gravy Train.

23. The climate is a common good, belonging to all and meant for all.

At the global level, it is a complex system linked to many of the essential conditions for human life.

A very solid scientific consensus indicates that we are presently witnessing a disturbing warming of the climatic system.
…
101. It would hardly be helpful to describe symptoms without acknowledging the human origins of the ecological crisis.

Encyclical Letter: Laudato si’ on Care for our Common Home
http://www.catholicnews.org.uk/content/download/57374/439413/file/laudato-si-EN.pdf

Vatican City, officially the Vatican City State is a walled enclave within the city of Rome.

With an area of approximately 44 hectares (110 acres), and a population of 842, it is the smallest internationally recognized independent state in the world by both area and population.

https://en.wikipedia.org/wiki/Vatican_City