Abstract
Gustav Radbruch has made a fundamental contribution to legal thought, namely by offering the concept of legal justice, legal benefit, and legal certainty as the main purposes of law. Albeit those three legal ideas had become widely accepted in legal circles, they are yet to be fully developed. This research reflects that those three legal ideas are not fully capable of addressing legal issues related to the ever-increasing threats of ecological crisis. In order to respond to such problem, this research methodology uses a legal philosophy approach, by studying thought over thought, dialoguing theory with theory, and theory vis-à-vis practice. This article proposes the idea of “sustainability” as the meta-value underlying legal development.