(d) Target relative to the reference indicator, expressed numerically, for example in percentage or amount of reduction; At least 25% (20,000 Gg CO2 eq.) by 2030 against a base year of 2010 under the business as usual scenario with limited international support or By 47% (38,000 Gg CO2 eq.) with substantial international support. (e) Information on sources of data used in quantifying the reference point(s); Sources of information include; Zambiaâs Biennial Update Report and Third National Communication submitted to UNFCCC Secretariat in 2020. (f) Information on the circumstances under which the Party may update the values of the reference indicators. The value of the reference indicator has been updated due to the fact that GHG emissions have been recalculated as a result of change of methodologies.