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In his 1931 address, Pope Pius XI (r. 1922-1939)
Coal
A combustible black or brownish-black sedimentary rock used primarily as a fuel in the production of electricity and heat, formed from plant remains over millions of years.
Oil
A viscous liquid derived from petroleum, used as fuel and in the manufacture of various goods.
Natural Gas
An energy-producing fossil fuel that predominantly contains methane, utilized for heating, cooking, and generating electricity.
Net Energy Ratio
A metric that compares the amount of energy produced to the amount of energy used to produce it.
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