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25 December 2019
9 April 2018
4 July 2012
2 September 2010
17 January 2009
24 December 2008
13 November 2008
11 November 2008
SW: →Carbon dioxide: minor re-org
m+6
SW: rixing refs
m-425
SW: fixing refs
m-134
SW: typo
m-1
SW: redoing article; added info on SO2 and NOx, coal waste, CCS, etc
+9,672