19120614 Coal consumption affecting climate - Plainfield Courier News - global warming.jpg — with earlier publication date, though quotation was in the March 1912 Popular Mechanics.
191203 Furnaces of the world - Popular Mechanics - Global warming.jpg
(likely the first publication of this passage)
19120814 Coal Consumption Affecting Climate - Rodney and Otamatea Times.jpg
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Newspaper article from 1912 describing how burning coal adds carbon dioxide to the atmosphere to cause global warming.