Abstract
Abstract This study proposes environmental DEA-based models to measure energy use efficiency, CO2 emissions efficiency, and an environmental-economic efficiency (EEE) for the Asia-Pacific Economic Cooperation (APEC) economies for the period of 2006–2010. In our models, population and total primary energy consumption are the two inputs, while GDP and CO2 emissions represent the desirable and undesirable outputs, respectively. Empirical results from 20 APEC economies showed that Australia, Brunei, Hong Kong, and Singapore were identified as efficient countries for five consecutive years from 2006 to 2010 in terms of energy use efficiency; as for CO2 emission efficiency, Brunei, Hong Kong, and Singapore were identified as efficient countries for the five consecutive years from 2006 to 2010. As far as EEE is concerned, most countries in APEC exhibited higher economic efficiency than environmental efficiency. Moreover, both energy use efficiency and CO2 emission efficiency were found to be significantly related to the EEE value (p
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