1. 
   GHG
   acronym: greenhouse gas(es)
   Found op http://cdiac.ornl.gov/pns/acronyms.html#G
   
   
2. 
   GHG
   Green House Gases
   Found op http://www.contractorsunlimited.co.uk/glossary.shtml
   
   
3. 
   GHG
   Greenhouse gas
   Found op http://www.eon-uk.com/about/328.xhtml
   
   
4. 
   GHG
   GreenHouse Gas
   Found op http://www3.sympatico.ca/dhaughey/j1930.htm
   
   
5. 
   GHG
   See greenhouse gas (GHG)
   Found op http://www.encyclo.co.uk/local/21114
   
   
6. 
   ghg
   1) Greenhouse gas
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/ghg/1
   
   

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