Volcanic versus anthropogenic carbon dioxide - Gerlach - 2011 - Eos, Transactions American Geophysical Union User Azathoth2, in the Climate Skeptics: Trying to see through the alarmism subreddit, 04 Feb 2015
Volcanic versus anthropogenic carbon dioxide - Gerlach - 2011 User Tommy27, in the Information about the world's climate subreddit, 03 Feb 2015