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‘No net loss’ (NNL) conservation policies seek to address development impacts on biodiversity. There have been no peer-reviewed multinational assessments concerning the actual implementation of NNL policies to date. Such assessments would facilitate more informed debates on the validity of NNL for conservation, but assessing implementation requires data. Here, we explore data transparency concerning NNL implementation, with four European countries providing a case study.

Biodiversity offsets (offsets) are the most tangible outcome of NNL policy. Using an expert network to locate all offset datasets available within the public domain, we collated information on offset projects implemented in France, Germany, the Netherlands and Sweden. Implementation data for offsets were found to be non-transparent, but the degree of transparency varies widely by country. We discuss barriers preventing data …