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This presentation and accompanying methodological summary compares the environmental effectiveness of candidate metrics and test points for an ICAO CO2 standard. Two primary comparisons are made: between metrics with simple payload components (e.g. ton-km and seat-km) and those which include proxies of aircraft productivity (e.g. take-off weight and useful load), and between a standard measured at maximum aircraft potentials (here, maximum range at maximum payload) vs. at a test point more representative of actual operations.