Last October, the 11 member states of the Association of Southeast Asian Nations—Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, Timor-Leste, and Vietnam—adopted a historic Declaration on the Right to a Safe, Clean, Healthy and Sustainable Environment, a commitment that matters deeply for the 680 million people across Southeast Asia who depend on the region's natural heritage. Now, as governments work to draft a regional plan of action to bring this declaration to life, the real test begins: implementation.
The right to a healthy environment has been gaining momentum globally for years. The United Nations General Assembly proclaimed it as a fundamental human right in 2022 with overwhelming support—161 governments voted in favor, none against, and only eight abstained. More than 100 countries now enshrine it in their constitutions. Yet ASEAN's approach stands apart. It represents the first time any region has attempted to elaborate comprehensively on all aspects of this right, going far beyond what previous regional treaties in Europe and Latin America have achieved.
That ambition reflects a growing clarity about what the right actually demands of governments. In July 2025, the International Court of Justice issued a landmark opinion on climate change stating that the human right to a healthy environment is inherent and essential for other rights—the right to life, health, and an adequate standard of living. International tribunals have since clarified that states have both procedural and substantive obligations. Procedurally, governments must protect people's access to environmental information, their ability to participate in environmental decision-making, and their right to seek justice for environmental harm. They must also safeguard those exercising freedom of expression and association, especially activists opposing government-backed projects or powerful businesses.
Substantively, states must work to provide safe air and water, protect the climate system, and conserve natural ecosystems. Critically, they must ensure that environmental laws and policies don't impose disproportionate burdens—such as exposure to hazardous waste and toxic substances—on marginalized communities.
The ASEAN declaration reflects these principles, though its drafting process was itself groundbreaking. The ASEAN Intergovernmental Commission on Human Rights convened a series of meetings that, for the first time in ASEAN history, included both government representatives and civil society in a dedicated working group. While governments retained final decision-making authority, the inclusion of civil society voices left a visible mark on the document. Still, some advocates noted gaps: the declaration lacks clearer references to Indigenous peoples' rights and stops short of explicitly recognizing environmental human rights defenders—a concerning omission in a region where activists face real threats.
The urgency of protection is evident. Southeast Asia faces enormous environmental challenges, and too often governments have failed to protect the rights of those on the frontlines. The jailing of five Mother Earth Cambodia activists—Ly Chandaravuth, Long Kunthea, Phuon Keoraksmey, Thun Ratha, and Yim Leanghy—underscores how environmental justice remains fragile. Yet the declaration itself signals that change is possible. The next step—turning words into action through effective regional implementation—will determine whether this commitment becomes a genuine shield for the millions of people whose lives and livelihoods depend on Southeast Asia's forests, coral reefs, and rivers.