Climate change litigation is a rapidly growing field in many countries and human rights obligations are increasingly an integral part of the equation. The Irish Supreme Court’s 2020 judgment invalidating Ireland’s National Mitigation Plan for transitioning to a low carbon, climate resilient and environmentally sustainable economy by 2050 has been widely praised by commentators. But the case warrants far more critical scrutiny. The Court’s findings on standing to sue, the relevance of human rights provisions in this context, and the existence of a derived right to a healthy environment, are all retrogressive and augur badly for the future of rights-based climate change litigation in Ireland.