Approved by: Hooi Hooi Lean, University of Science Malaysia (USM), Malaysia
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Following publication, the authors raised concerns regarding the scientific validity of the article. An investigation was conducted in accordance with Frontiers' policies. It was found that the complaints were valid and that the article does not meet the standards of editorial and scientific soundness for Frontiers in Environmental Economics, therefore, the authors and Editorial Office are in agreement that that the article has been retracted.
This retraction was approved by the Chief Editors of Frontiers in Environmental Engineering and the Chief Executive Editor of Frontiers. The authors agree with this retraction.