Several Environmental Accounting methods have been developed over the last four decades to assess sustainability options from a system-wideperspective.These Environmental Accounting methods include: ecological footprinting,carbon footprinting,emergy analysis,ecological pricing,lifecycle assessment and environmental input-output analysis.Regrettably,the contemporaneous development of these tools have often occurred in isolation from each other,even though they often seek to serve common analytical and evaluative purposes,as well as serving similar communities of interest.It is the central argument of this paper that in spite of this isolation,these tools have a number of common features-that is,they can be mathematically reduced to similar analytics and they often confront the same methodological issues (allocation problem,weighting,commensuration,boundary setting).