Blue and Green: Pope Francis will write a letter to 1.2bn Catholics all over the world, emphasising the importance on sustainable living, eradicating poverty and calling on world leaders to address climate change.
The pope has been critical of high profile issues in the past. He has spoken out against the dangers of fracking and environmental devastation, and in his most controversial episode he publically condemned trickle down economic theories, warning of an economy of exclusion.
But in his latest endeavour,...