| Forcing Phenomenon | LOSU | 
      
        | Well-mixed greenhouse gases | High | 
      
        | Stratospheric O3 | Medium | 
      
        | Tropospheric O3 | Medium | 
      
        | Direct sulphate aerosols | Low | 
      
        | Direct biomass burning aerosols | Very low | 
      
        | Direct fossil fuel aerosols (black carbon) | Very    low | 
      
        | Direct fossil fuel aerosols (organic carbon | Very    low | 
      
        | Direct mineral dust aerosols | Very    low | 
      
        | Indirect aerosol effect | Very low | 
      
        | Contrails | Very    low | 
      
        | Aviation-induced cirrus | Very    low | 
      
        | Land-use (albedo) | Very    low | 
      
        | Solar | Very    low |