

Sources Natural sources , such as volcanoescontribute
to environmental levels of sulfur dioxide  
photochemical smog , acid rain , and resultant degradation of ecosystems and bio - diversity(passive) caused by
sulfur dioxide environment  
acts of naturecan ... cause
a release of sulfur dioxide into the environment  
Dirtcan cause
sulphur dioxide for people  
due to the rise in combustion of fossil fuels(passive) is caused
Sulphur Dioxide in the air  
due to the increase in the burning of fossil fuels(passive) are caused
sulphur dioxide in the air  
Coal - Fired Power Plants ( 2003(passive) Caused by
Sulphur Dioxide Pollutions  
burning coal(passive) caused by
Sulphur dioxide pollution  
the fumaroleswere creating
an environment high in sulphur dioxide  
acid rain which has a negative impact on plants and marine animalscauses
acid rain which has a negative impact on plants and marine animals  
http://www.mma.gob.cl/retc_ingles/1316/w3-article-51518.html ( Damage(passive) caused by
http://www.mma.gob.cl/retc_ingles/1316/w3-article-51518.html ( Damage  
acid depositioncauses
acid deposition  
to acid rainsleads
to acid rains  
in amorphous molybdenum disulfideresults
in amorphous molybdenum disulfide  
sulphur cooling(passive) caused by
sulphur cooling