The Vatican recently announced that it intends to spend 660 million dollars to create what will effectively be Europe's largest solar power plant. This massive 100 megawatt photovoltaic installation will provide enough energy to power all of its 40,000 households.

To reduce its greenhouse emissions even more, the Vatican is contemplating using an electric popemobile and the Pope's summer residence is being fitted to run on power from the methane generated by the horse stables.

(Bloomberg.com via Inhabitat.com)