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Greenhouse gases (GHG) could lead to global warming, which may bring about various disturbances to globalecosystem. Other than primary benets that are too extensive, the ancillary benet from GHG reduction has beenestimated to provide justification for national actions. Five scenarios for 5 to 40% reduction of GHG wereevaluated for the benet/cost efciency, using the cost estimates from a previous study. Their benets were also(5~ 10%) seem to be more efcient than higher reduction scenarios(30~ 40%).