One year since ICJ climate advisory opinion: UNEP urges stronger laws & active courts for a just transition
The United Nations Environment Programme (UNEP) released a report marking one year since the International Court of Justice's (ICJ) advisory opinion on states' climate obligations
The report calls for stronger environmental laws, more active courts, and fair financing mechanisms to secure a "just transition" to sustainable economies
It stresses rights-based, inclusive policies so that vulnerable communities, workers, and future generations are not left behind in the shift away from fossil fuels
The report examined just-transition implementation across 18 countries and regions, including a case study on Jharkhand's inter-departmental task force in India
It identifies persistent financing gaps and proposes solutions including green bonds, carbon credits, blended finance, and direct revenue-sharing with affected communities
ICJ Advisory Opinion on "Obligations of States in Respect of Climate Change" (2025)
On 23 July 2025, the International Court of Justice delivered its advisory opinion (Advisory Opinion No. 187) clarifying, for the first time, states' legal obligations under international law regarding climate change, and the legal consequences for states that fail to meet them. The request originated from a UN General Assembly resolution in March 2023, driven by a campaign led by Vanuatu and other climate-vulnerable island states, joined by a broader coalition of co-sponsoring countries.
Key Details
- Requested by UN General Assembly resolution, March 2023, following a campaign spearheaded by Vanuatu
- Opinion delivered: 23 July 2025
- The ICJ held that states have an obligation to prevent significant harm to the climate system and must cooperate in good faith to address climate change
- Failure to act can constitute an "internationally wrongful act" under international law, including a due-diligence obligation to regulate the conduct of private actors (e.g., fossil fuel companies) within a state's jurisdiction
- Advisory opinions of the ICJ are not binding judgments (unlike contentious case rulings) but carry significant interpretive authority for international law
The UNEP report is explicitly framed as a one-year follow-up to this opinion, translating its legal findings into an operational agenda — stronger domestic laws and more assertive judicial enforcement — for the "just transition" component of climate action.
Just Transition Framework
"Just transition" refers to ensuring that the shift to a low-carbon, environmentally sustainable economy is fair and inclusive — protecting workers in carbon-intensive industries, vulnerable communities, and future generations from disproportionate transition costs. The concept originated in labour and environmental justice movements and has since been formally incorporated into global climate governance, notably the Paris Agreement's preamble (2015) and the ILO's Just Transition Guidelines (2015).
Key Details
- UNEP's report defines just transition as a "fair, inclusive and rights-based transformation" towards environmentally and socially sustainable economies
- The Paris Agreement's preamble references "the imperatives of a just transition of the workforce"
- Country examples cited: South Korea's framework law centring just transition in climate policy; South Africa's climate strategy incorporating nature-based solutions; India's Jharkhand Just Transition Task Force coordinating 17 state government departments
- Financing mechanisms proposed: green bonds, carbon credit revenue, blended finance, and direct revenue-sharing with affected communities
The report uses the ICJ opinion's legal foundation — that states owe binding due-diligence obligations on climate harm — to argue that just-transition financing and worker/community protections are not optional policy add-ons but components of states' underlying legal obligations.
Growing Role of Climate Litigation
Climate litigation is an increasingly significant enforcement channel for climate obligations, with cases being brought in domestic, regional and international courts examining state and corporate responsibility for emissions and the distribution of transition costs and benefits.
Key Details
- The ICJ opinion followed other significant international climate law developments, including advisory proceedings before the International Tribunal for the Law of the Sea (ITLOS, 2024) and the Inter-American Court of Human Rights
- In India, courts have used Article 21 (right to life) to read in a right against the adverse effects of climate change, as in M.K. Ranjitsinh v. Union of India (2024)
- UNEP's report notes climate litigation increasingly scrutinises how the costs and benefits of decarbonisation are shared among workers, communities, and future generations
The report's call for "active courts" reflects this broader trend of using litigation, both international (ICJ, ITLOS) and domestic, as an enforcement mechanism for climate commitments that political processes alone have been slow to deliver.
- ICJ advisory opinion delivered: 23 July 2025 (Advisory Opinion No. 187)
- UN General Assembly resolution requesting the opinion: March 2023, initiated by Vanuatu
- UNEP report released: marking the opinion's first anniversary (July 2026)
- Just-transition case studies covered: 18 countries/regions
- India example cited: Jharkhand's Just Transition Task Force, coordinating 17 government departments
- Financing tools proposed: green bonds, carbon credits, blended finance, community revenue-sharing