“…This is often a particular danger for innovations whose novelty means there has been little time for evidence to accumulate, or where incumbent interests discourage research or assessment of the requisite kinds (Stirling and Gee 2002). Before invoking a lack of evidence of harm, it is necessary to think about how visible this evidence might actually be expected to be if it existed, or how vigorously it is sought (McGlade et al 2013). Identifying false negatives is often more important than avoiding false positives (EEA 2013).…”