This article argues that the current approach of the European Court of Human Rights (ECtHR) to evaluating scientific evidence is lacking and hampers its ability to properly handle cases involving questions of science, and particularly environmental cases which are replete with them. It identifies three problem areas in relation to the ECtHR's adjudication of such cases: the evaluation of evidence proving the causation of harm; the extent of the Court's deference to the determinations made by national authorities; and the Court's evaluation of evidence adduced by the respondent State in justifying its conduct as being in line with the standard of due diligence. Several cases that illustrate the recurring problem of the lack of science-based reasoning in the Court's judgments are then identified, highlighting the shortcomings of its approach. Such issues have an impact upon the legitimacy of the ECtHR, and it is therefore imperative that it engages more robustly with scientific evidence. The article suggests the best way to do this would be for the ECtHR to make more use of its power to seek assistance from independent scientific experts in environmental cases.