The Vatican sought to up its green credentials this week by switching on its massive electricity generating solar panels on the Pope Paul VI Hall. The development is one of a series of intended environmental initiatives.
The biblical story of creation, echoed in the prologue to John's Gospel, famously contains the divine injunction, "Let there be light." But the Church of England says that in an age of eco-cre, a little less light might be needed.
Bishop Munib Younan of the Evangelical Lutheran Church has said Christians need a stronger voice in Jerusalem in order to prevent tensions spreading there, and that Muslims and Christians should work together on ecology issues.