The issue focused on anthropogenic greenhouse gases (GHGs), methane (CH4), nitrous oxide (N2O), perfluorocarbons (PFCs), ozone (O3), sulfur hexafluoride (SF6), nitrogen dioxide (NO2), hydrogen chloride (HC), methane hydrate (CH4NH3), methane hydrate oxide (CH4MH), methyl tertiary butyl ether (MTBE), orthophosphates (OPA), dichloromethane (