UNGA Climate Resolution

Walking the Tightrope of Climate Accountability: The United Nations General Assembly’s Resolution on the International Court of Justice’s Climate Advisory Opinion

Elif Naz Němec

4. 6. 2026

The adoption of United Nations General Assembly (UNGA) Resolution A/80/L.65 on 20 May 2026 formally welcomed the International Court of Justice’s (ICJ) landmark 2025 Advisory Opinion (hereinafter referred to as Advisory Opinion) on climate change. This development addresses two of the most critical legal questions of our time, shaped by climate change: What are the precise international legal obligations of States to protect the climate system from anthropogenic greenhouse gas (GHG) emissions for States as well as present and future generations, and what are the legal consequences, including state responsibility and reparation, for acts and omissions causing significant environmental harm? In this context, one may ask what function the Resolution serves in climate action and whether it has legal and practical significance. With this Resolution, the UNGA embedded the ICJ’s finding into the political agenda and legal expectations of the international community. Yet would such adoption suffice to close the global accountability gap concerning climate action?

From Vanuatu’s Initiative to The Hague and the General Assembly

The ICJ, on 23 July 2025, delivered a unanimous advisory opinion (for a detailed evaluation of the Advisory Opinion itself, see Hana Müllerová’s earlier commentary, “ICJ Advisory Opinion brings surprising shifts in climate law”). With this opinion, the ICJ established that protecting the climate system is a binding legal duty that derives from international environmental treaties, human rights instruments, and customary international law (paras 134, 172,173, 316, 334, 335). This Advisory Opinion, in fact, stemmed from a global campaign initiated by Pacific Island students and spearheaded diplomatically by Vanuatu. The ICJ, in its opinion, clarified that “a State’s failure to take appropriate action to protect the climate system from greenhouse gas emissions” may constitute an internationally wrongful act that triggers State responsibility (para 427). Following this ruling, a cross-regional coalition proposed the draft UNGA Resolution A/80/L.65 to translate the ICJ's judicial findings into an actionable multilateral framework. Eventually, the UNGA adopted Resolution A/80/L.65 on 20 May 2026 (hereinafter, the Resolution).  

The Legal Significance and Limits of the UNGA Resolution

The UNGA Resolution’s significance should not be reduced to mere political symbolism, because it operationalises the Court's findings across several critical domains of international law.  By endorsing the Advisory Opinion and calling upon States to comply with the obligations identified by the ICJ, the Resolution reinforces the legal authority of the Court’s interpretation of existing international law. However, its legal effect remains limited, since the Resolution does not itself create new climate obligations, nor does it establish sanctions, effective monitoring mechanisms, or binding implementation procedures. Therefore, the Resolution must be understood and assessed within its limits. 

First, when assessing the 'limits' of the Resolution, one must acknowledge the formal boundaries inherent in UNGA resolutions. After all, UNGA resolutions are not inherently binding upon Member States. As a general rule, UNGA resolutions do not have the binding force of treaties or Security Council decisions adopted under Chapter VII of the UN Charter. Therefore, UNGA resolutions often operate as soft law. Nevertheless, this does not necessarily mean these resolutions lack normative value.  It is still important to note that such resolutions can play a significant role in the progressive development and codification of international law. As legal scholars and UN practice have recognised, resolutions do not become binding merely by virtue of their adoption. Still, they can provide “an important impetus to the emergence of new customary rules”.

Still, it is important to highlight that a UNGA resolution may contribute to the formation or evidence of customary international law, but it does not automatically create custom. Its relevance depends on factors such as wording, voting pattern, repetition, explanations of the vote, and subsequent State practice. In other words, adoption of a UNGA resolution alone does not transform its content into binding customary rules.

Moreover, during the debates for the Resolution, certain States framed it as an attempt to impose new climate obligations through a non-binding advisory opinion and a General Assembly resolution. However, this criticism overlooks the central legal claim of both the Advisory Opinion and the Resolution: they do not create new obligations but clarify States’ climate obligations under existing, binding international law. The United States argued that the Resolution was highly problematic because it called on States to comply with so-called "obligations" derived from the ICJ's non-binding conclusions. The Saudi Arabia representative also warned that the resolution incorrectly generated the "impression that there are new obligations or extended obligations that go beyond what was collectively agreed". The United States’ representative purported that the Resolution improperly treated the Court's opinion as “irrefutably authoritative” and warned that deriving duties from the Advisory Opinion, such as an expansive “duty to prevent significant transboundary harm to the global climate”, would impermissibly interfere with State sovereignty and domestic energy policies.

These pushbacks stem from the ICJ’s refusal to limit state responsibility to existing international climate law instruments. The ICJ rejected the argument that climate obligations are exclusively limited to the United Nations Framework Convention on Climate Change (UNFCCC) and the Paris Agreement. When identifying these obligations, the ICJ examined the entire corpus of international law and did not limit the initial inquiry to a particular regime (Advisory Opinion, para 98). This rejection is evident in the Court’s analysis that dismissed the application of lex specialis arguments:

“170. There is, in particular, no indication that the climate change treaties are meant to apply while simultaneously excluding general customary international law or other treaty rules on the protection of the environment. The fact that the climate change treaties have been carefully negotiated and represent a calibrated set of interrelated rules does not, in and of itself, provide such an indication. States parties to the climate change treaties were aware of their normative context and could have expressed a possible intention to displace other rules and principles had they so wished.

171. For these reasons, the Court considers that the argument according to which the climate change treaties constitute the only relevant applicable law cannot be upheld and finds that the principle of lex specialis does not lead to a general exclusion by the climate change treaties of other rules of international law.”

The rejection of the lex specialis argument did not amount to the creation of new obligations for States in the context of climate change. Rather, it clarified that climate instruments do not operate as a closed legal regime that excludes the application of other rules of international law. Accordingly, the Court opened the way for the application of general international law, human rights law, environmental law, and other relevant legal frameworks to climate change and the UNGA adhered to this stance through the Resolution.

By affirming that acts or omissions that cause significant harm to the climate system may constitute internationally wrongful acts under international law, neither the Resolution nor the Advisory Opinion creates new legislation for States. They provide a systematic interpretation of how the current, binding international legal order applies to a phenomenon that poses an existential threat to livelihoods. Moreover, under public international law, neither the ICJ, through its advisory jurisdiction, nor the UNGA, through its resolutions, possesses the competence to unilaterally impose new binding legal duties on States without their consent, nor does either purport to do so in this context. The ICJ, in its opinion, rejected claims that it legislates, and highlighted that it merely “states the existing law” (para 48). The Court also made this clear by stating that its role is "limited to identifying the existing obligations of States under international law" (para 100). Accordingly, the text of the UNGA Resolution does not go beyond what the ICJ stated in the Advisory Opinion. The Resolution expressly characterises the ICJ’s opinion as an "authoritative contribution to the clarification of existing international law" (Operative Paragraph 1). Its operative paragraphs do not dictate new treaty terms; rather, the Resolution "[c]alls upon all States to comply with their respective obligations under international law... as identified by the Court" (Operative Paragraph 2). The representative of Vanuatu has further emphasised this: “The Opinion does not invent new law; it clarifies the law that already binds us”.

The dual function of clarifying and reinforcing the Resolution is evident in the way it restates several key findings of the ICJ without imposing independent obligations of its own. The Resolution reaffirms the ICJ’s findings that the 1.5°C warming limit is not merely an aspirational target but a legally relevant goal for all States. Rather than establishing a new temperature obligation, the Resolution calls upon States to be sufficiently ambitious to combat climate change and collectively achieve the temperature limit set out in the Paris Agreement (Operative Paragraph 4). Similarly, the Resolution confirms the ICJ’s finding concerning the existence of a stringent customary duty of due diligence and calls upon States to comply with their “respective obligations under international law to ensure the protection of the climate system” (Operative Paragraph 2).  These obligations are not presented as newly created by the Resolution, but as obligations already identified by the Court as stemming from a wider legal framework, including customary international law, the duty to prevent significant environmental harm, the duty to cooperate, human rights law, the law of the sea, biodiversity law, and principles such as equity, intergenerational equity, common but differentiated responsibilities, and precaution.

The same pattern of clarification and reinforcement can be observed in the Resolution's paragraphs concerning human rights. The Resolution has reinforced the nexus between human rights protection and climate change. Here again, the Resolution does not create a new human rights regime for climate change, but echoes and consolidates the ICJ’s recognition that climate action must be understood in light of existing human rights obligations. It calls upon States to guarantee “full, meaningful and equal participation of Indigenous Peoples, local communities, people of African descent, women and girls, children and youth, persons with disabilities and people in vulnerable situations in decision-making on climate action, where appropriate, including through access to information and access to justice”, in other words, in all levels of climate decision-making (Operative Paragraph 5).

This pattern is also reflected in the Resolution’s treatment of statehood and maritime entitlements in the context of sea-level rise. The Resolution addresses urgent concerns about climate displacement and the continuity of statehood in the face of the risks posed by rising sea levels.  In this context, it affirmed the presumption of continuity of statehood (Operative Paragraph 7). This confirmation provides a legal certainty that States will not lose their sovereignty or maritime entitlements even if a constituent element of their statehood, their territory, disappears due to rising sea levels.

The Resolution further reinforces the ICJ’s approach by linking climate displacement to existing human rights protections, rather than creating a new protection regime. Crucially, the Resolution confirms the applicability of the principle of non-refoulement to persons displaced due to climate change and emphasises that these individuals cannot be returned to their home countries by force if climate change impacts pose a real and irreparable risk to their right to life under Article 6 of the International Covenant on Civil and Political Rights (Operative Paragraph 8).

Where Consensus Frays: Weak Follow-Up and Political Resistance

Despite its historic nature, the Resolution is not without flaws. A primary criticism is that the Resolution's follow-up mechanism was substantially diluted during negotiations. Paragraph 10 of the Resolution requests the UN Secretary-General to report on compliance. However, it stipulates that this reporting must be done "without prejudice to the legal positions of States and without implying any determination of responsibility" (Operative Paragraph 10). So, the difficult questions of attribution, how to identify which States are breaching their obligations and liable towards other States, present and future generations, remain unresolved, and a significant accountability gap is still standing as the elephant in the room. Therefore, the mechanism foreseen in the Resolution does not go beyond the weaker, facilitative mechanisms of the UNFCCC.

It is worth mentioning that the Resolution was not adopted unanimously. Although it was adopted with 141 votes in favour, 8 States voted against, and 28 abstained, including the Czech Republic. The opposing and abstaining States expressed profound concern over the alleged expansion of legal liabilities. As mentioned above, States such as the United States and Saudi Arabia argued that the resolution improperly attempts to confer binding operational weight on a non-binding advisory opinion, thereby interfering with sovereign energy policies and domestic regulations. The significant number of abstentions is also noteworthy.  The broad support from States surely strengthens the Resolution’s legitimacy, yet the negative votes and abstentions show where resistance to climate accountability remains most pronounced. It can also be argued that this resistance stems from these States’ attitudes regarding the economic implications of rapid defossilization and the potential for increased exposure to international climate litigation.   

After the Vote: What Comes Next?

Overall, the Resolution conveys an important message: climate change is not merely a political or environmental policy question but a matter of general international law. Moreover, the Resolution underscores that climate change cannot be confined to the limited framework of the UNFCCC and the Paris Agreement but must instead be understood as an issue situated within a broader international legal framework. It does not create a novel binding obligation or climate target for States, yet it certainly has the potential to reinforce the systemic integration of climate obligations stemming from different binding sources, including human rights law, environmental law, and the law of state responsibility.

Simply put, the UNGA boosts the ICJ’s advisory findings by giving them greater political weight, while also stopping short of resolving all questions concerning responsibility and reparations for breaches of climate obligations. There is a non-negligible degree of caution in the Resolution regarding questions such as causation and attribution. It seems to defer these challenging questions to potential future climate litigation. In this sense, the Resolution reinforces the ICJ’s findings without replacing the role of courts or other competent bodies in determining responsibility in concrete cases.

The Resolution’s future legal relevance lies primarily in its potential use by litigants, treaty bodies, and human rights institutions. Future litigants may (and most probably will) cite the UNGA Resolution to emphasise the political endorsement of the ICJ’s conclusions concerning binding international obligations concerning climate change under general international law. They may rely on the significant number of States that support this endorsement. The UNGA Resolution may also be used by other treaty bodies or human rights institutions in interpreting climate-related obligations. Hence, one may conclude that the Resolution is an important tool for legal clarification and mobilisation in the context of climate change.

Is it harder for States to treat the ICJ’s Advisory Opinion as a purely abstract statement? Following the UNGA Resolution, the answer is clearly yes. How will courts utilise the ICJ's clarified obligations and the UNGA's endorsement to adjudicate climate liability cases against both States and major corporate polluters? Given the limited scope of the UN Secretary-General's follow-up action, through which multilateral or judicial mechanisms will State responsibility and reparations actually be apportioned? These are the questions whose answers will only emerge over time and will need to be traced through future practice.