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Many evaluations of the effectiveness of these activities have relied entirely on qualitative or short-term assessments by scientists and managers from the central government and local governments, who have a vested interest in reporting positive results rather than relying on carefully controlled, long-term field-based monitoring and quantitative studies (Shi and Rao 2010). [...] the assessments may contain serious bias toward short-term, non-holistic solutions that often favor land managers and local officials, and this raises questions about the validity of the evaluations.