Green Pope and Carbon-Free Vatican

The Vatican is also a nation-state. John L. Allen Jr. informed last Friday that

the Vatican became the first state in Europe to go completely carbon-neutral, signing an agreement with a Hungarian firm to reforest a sufficiently large swath of Hungary's Bükk National Park to offset its annual CO2 emissions.

It announced a month earlier it was covering Pope Paul VI Audience Hall with a thousand photo cells for heating, cooling and light.

What is Pope Benedict's theological rationale? Natural law. Read Mr. Allen's account.