The flash floods that struck North Sumatra in late 2025 caused significant social, economic, and ecological losses and raised questions about the responsibility of those contributing to environmental degradation in upstream areas. This event is viewed not only as a natural disaster but also as a form of ecological sin resulting from the exploitation of natural resources beyond the ecosystem's carrying capacity. This study aims to analyze the concept of ecological sin from an environmental law perspective and examine the application of strictness to corporations suspected of contributing to the flash floods. The method used is normative legal research, utilizing regulatory approaches, conceptualization, and case studies through a literature review. The results indicate that watershed damage due to deforestation, land conversion, and extractive industry activities increases the risk of hydrometeorological disasters. The principle of strict liability provides a strong legal basis for holding corporations accountable without proof of fault, in order to achieve ecological justice, environmental restoration, and protection of affected communities.
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