• [2013-05-22] Volcanoes Cause Climate Gas Concentrations to Vary
  + http://www.eurekalert.org/pub_releases/2013-05/haog-vcc052213.php + http://www.atmos-chem-phys-discuss.net/13/12389/2013/acpd-13-12389-2013.html
  in Tietoukka Monitor > 2013 > 2013-21 with stratosphere sulfur_dioxide volcanic_eruptions
• [2013-12-19] NASA Satellite Sees Increase of India's Sulfur Dioxide Emissions
  + http://earthobservatory.nasa.gov/IOTD/view.php?id=82626 + http://pubs.acs.org/doi/abs/10.1021/es4039648
  in Tietoukka Monitor > 2013 > 2013-51 with coal_energy india sulfur_dioxide

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