Pope Benedict XVI was known as the Green Pope.
"After just seven short years of service, Pope Benedict XVI shocked the world by announcing his resignation [Monday] morning. Perhaps struggling to adapt to a world increasingly dependent on technology, the Pope cited his advanced age as a major factor in the decision. ...
Benedict made headlines when he took office in 2005, and surprisingly, many of them were attributed to his strong pro-environmental stance. In many instances, he used traditional Catholic principles to advance progressive causes, including the pressing need to address climate change. ...
Dubbed 'the Green Pope' for his interest in environmental issues, Benedict XVI helped to author several books that share his views on the real meaning of progress and development, and what that means for our planet of limited resources. In 2009, Ten Commandments for the Environment was released by Ave Maria Press. In it, journalist Woodeene Koenig-Bricker weaves together Pope Benedict’s key statements on environmental justice, and offers commentary that helps to unpack the 'Ten Commandments for the Environment,' which had only recently been released by the Pontifical Council for Justice and Peace. Then in 2012, Pope Benedict published The Environment, which shares his thoughts on everyone’s right to food, right to water and responsible sharing."
Beth Buczynski reports for Earth Techling/Huffington Post February 11, 2013.