| Key categories using the level assessment are identified
as any category which, when summed in descending order of magnitude
for a given year, cumulatively add up to 95 percent of the total level assessment
for that year. Level estimates are based upon the following equation: Key Category Level Assessment =│Source or Sink Category Estimate│/ Total Contribution Lx,t*= Ex,t* / Et* Where: Lx,t* = level assessment for source or sink x in year t. The asterisk (*) indicates that contributions from all categories (including LULUCF categories) are entered as absolute values. Ex,t* = │Ex,t │: absolute value of emission or removal estimate of source or sink category x in year t Et* = Σ│Ex,t│ : total contribution, which is the sum of the absolute values of emissions |
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and removals in year t. The asterisk (*) indicates that contributions from all categories (including LULUCF categories) enter as absolute values. Because both emissions and removals are entered with positive sign, the Total Contribution may be larger than a country’s total emissions less removals. |
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