{"id":29919,"date":"2026-09-29T08:00:56","date_gmt":"2026-09-29T13:00:56","guid":{"rendered":"https:\/\/blogs.law.columbia.edu\/climatechange\/?p=29919"},"modified":"2026-09-28T14:26:25","modified_gmt":"2026-09-28T19:26:25","slug":"scrutinizing-the-achievement-of-climate-targets-part-ii-emerging-trends-and-challenges-in-implementation-litigation","status":"publish","type":"post","link":"https:\/\/blogs.law.columbia.edu\/climatechange\/2026\/09\/29\/scrutinizing-the-achievement-of-climate-targets-part-ii-emerging-trends-and-challenges-in-implementation-litigation\/","title":{"rendered":"Scrutinizing the Achievement of Climate Targets, Part II: Emerging Trends and Challenges in Implementation Litigation"},"content":{"rendered":"

This is the second of two posts exploring the evolution of climate change implementation litigation. Part I<\/a> detailed how governments\u2019 duties to monitor and meet their climate commitments, and have transparent and attainable climate plans, are well-defined by international, regional, and domestic courts. This post focuses on how implementation cases are responding to a host of new challenges from governments, from overt forms of regression to persistent failures to implement climate commitments.<\/p>\n

Against the backdrop of these developments, implementation litigation has demonstrated considerable adaptability. Recent cases point to a number of evolving trends, including the strategic use of follow-up litigation, the growing integration of human rights arguments, the expanded role of scientific evidence and monitoring, and an increasing emphasis on consistency across government decision-making. The following sections reveal how these trends are reshaping implementation litigation and enhancing its capacity to strengthen government accountability amidst changing legal and political contexts.<\/p>\n

Confronting new forms of government regression<\/h2>\n

An especially concerning issue in climate litigation is the markedly overt attempts from governments to avoid responsibility for climate action through regressive measures that include weakening or erasing commitments already enshrined in law. As some acts also involve corporate climate litigation<\/a> and eliminating tort liability<\/a>, fully unpacking and addressing these developments is beyond the scope of this blog. However, spotlighting a few pending lawsuits can help illuminate how cases are relying on emerging implementation litigation trends \u2013 in particular human rights arguments and follow-up challenges \u2013 as part of a broader strategic and advocative response.<\/p>\n

It is useful to note that regression, which can affect both the ambition and implementation of climate commitments, is not a new phenomenon, and litigation has proven to be an effective counter to it. For instance, Urgenda Foundation v. State of the Netherlands<\/em><\/a> (2015, 2018, 2019) \u2013 the first case in which a court ordered a government to reduce their emissions by a specific amount \u2013 originated as a response to the weakened ambition of the Netherlands\u2019 2020 target. More recently, the Hungarian Constitutional Court<\/a> (2025) drew from the constitutional principle of non-regression to annul a provision of Hungary\u2019s climate law that was effectively obsolete, as the country had already achieved its relatively weak 2030 target and constitutional obligations required a more ambitious level of climate protection. That same year, Mexico\u2019s Supreme Court ruled in Greenpeace v. Mexico (on the Climate Change Fund)<\/em><\/a> that the elimination of a fund designed to implement climate action was an unconstitutional regressive measure that reduced protections related to the right to a healthy environment. The Six Youths v. Minister of Environment and Others<\/em><\/a> (2023) case also resulted in a historic settlement that acknowledged and eventually led to the correction of the regression in Brazil\u2019s 2020 NDC.<\/p>\n

However, governments have recently shown a greater willingness to dismantle key legal hooks containing climate obligations. A notable example comes from Ontario, Canada, where the youth plaintiffs in Mathur et al. v. His Majesty the King in Right of Ontario<\/em><\/a> filed their case, like Urgenda<\/em>, in response to a weakened climate target. In 2024, the Ontario Court of Appeal ruled favorably for the plaintiffs, determining that the provincial government voluntarily assumed a statutory obligation to produce a constitutionally compliant climate target and plan, and ordered the trial court to scrutinize the government\u2019s actions through this analytical lens. Just days before the start of that retrial, Ontario unilaterally repealed the sections of the law<\/a> that contained these statutory obligations and sought to argue that the case was accordingly moot. The plaintiffs filed a motion to reopen the appeal, requesting the appellate court to re-examine the unresolved constitutional arguments from their original appeal. Although the appellate court dismissed<\/a> the request, the plaintiffs\u2019 arguments will be heard once again in the Ontario Superior Court.<\/p>\n

In Germany, the government watered down<\/a> the climate law at the center of the Neubauer<\/em> case in 2024, abolishing binding sectoral goals and the requirement to correct missed targets. This regression sparked<\/a> a series of lawsuits led by environmental organisations, including Deutsche Umwelthilfe (DUH)<\/a>, Bund f\u00fcr Umwelt und Naturschutz Deutschland (BUND) and Solarenergie-F\u00f6rderverein Deutschland (SFV)<\/a>, Greenpeace and Germanwatch<\/a>, as well as thousands of individual plaintiffs, that are still pending. While each case reflects a different approach, they all draw from the Neubauer<\/em> judgment to argue that the weakened law does not sufficiently safeguard constitutional rights.<\/p>\n

These developments reveal the complex political dynamics behind new climate cases, which are more frequently invoking human rights arguments and relying on iterative challenges to hold governments accountable. The next two subsections delve further into these trends to underscore their potential to address not just climate regression but also governments\u2019 ongoing implementation failures.<\/p>\n

Advancing implementation through follow-up litigation<\/h2>\n

As described above, implementation litigation has a long track record of success, but a single case “is unlikely to serve as the \u2018silver bullet<\/a>\u2019 to ensure all government action will comply with its obligations in the future\u201d (Williamson, Udell and Fantozzi<\/a>, p. 135). Accordingly, even the most groundbreaking wins may require subsequent legal action and implementation challenges can function as a powerful avenue to \u201cpreserve hard-won legal gains<\/a>\u201d ((Williamson, Udell and Fantozzi<\/a>, pp. 55-56). These iterative cases can be relied on to consolidate prior precedents, sustain scrutiny of compliance with court-mandated orders, or respond to actual or potential regression in policy and legislation. The long-running history of two well-known implementation cases reflects the potential of this trend.<\/p>\n

In R (Friends of the Earth Ltd) v Secretary of State for Energy Security and Net Zero<\/em><\/a> (FOE I<\/em>) (2022),<\/em> the United Kingdom\u2019s (UK) High Court of Justice found that the net-zero strategy adopted by the UK was unlawful. The court concluded that the strategy lacked key information required for its approval under the Climate Change Act, the UK\u2019s framework climate law. In 2024, the court sided once again with the plaintiffs in R (Friends of the Earth Ltd) v Secretary of State for Energy Security and Net Zero<\/em><\/a> (FOE II<\/em>) (2024), finding the net-zero strategy to be unlawful for a second time. It noted that the strategy was not backed by evidence that the proposed policies would achieve the required mitigation targets. In October 2025, the UK government published a new plan<\/a> that, according to Friends of the Earth<\/a>, represents a \u201cstep forwards\u201d but may still not be fully fit for purpose.<\/p>\n

Similarly, in Commune de Grande-Synthe v. France<\/em><\/a>, the plaintiffs argued that the French government had significantly postponed its GHG reduction efforts, thereby creating a substantial shortfall that rendered the 2030 mitigation target \u2013 a 40% reduction compared to 1990 levels \u2013 unattainable. In 2021, the Supreme Administrative Court of France concluded that the government\u2019s structural delay and failure to comply with interim statutory targets was unlawful. In 2025, the Court closed the proceedings, holding that the government complied with injunctions to strengthen mitigation action. However, following the revision of climate targets at the European Union level, France was required to further enhance its domestic efforts. It thus adopted a new National Energy and Climate Plan<\/a> (NECP) setting a reduction goal of 50% by 2030 compared to 1990 levels. In the pending case Notre Affaire \u00e0 Tous v. France [\u201cle Proc\u00e8s de la Part Juste\u201d]<\/em><\/a>, the plaintiffs flag, inter alia<\/em>, that current reduction trajectories are not on track to achieve the targets required under the NECP.<\/p>\n

These cases illustrate how implementation litigation can at times unfold in phases. The iterative nature of this type of litigation may become even more pronounced as governments test the durability of earlier victories and consider measures that weaken regulatory frameworks, or as shifting geopolitical conditions threaten fossil fuel phaseouts in the name of energy security.<\/p>\n

Human rights as a catalyst for accountability<\/h2>\n

In line with the international and regional findings discussed above, human rights arguments will likely grow in prominence in future domestic implementation cases seeking to hold governments accountable for their climate commitments. This trend is already evident in both recent successful cases and a growing number of pending challenges across jurisdictions.<\/p>\n

For instance, in Zambia, the recently filed Climate Action Professionals Zambia v. Zambia Environmental Management Agency and the Attorney General<\/em><\/a> relies in part on rights-based arguments to contest the non-operation of several mechanisms, including a fund designed to help implement the country\u2019s climate law. This line of argumentation \u2013 aimed at pushing back against government inertia and inactive implementation financing \u2013 can be seen as a transnational incarnation of the PSB case<\/a><\/em> in Brazil mentioned above, as well as Greenpeace v. Mexico (on the Climate Change Fund)<\/em><\/a> (2025), described above.<\/p>\n

A similar pattern is emerging in Europe. In Greenpeace NL and 8 citizens of Bonaire v. the Netherlands<\/em><\/a> (2026), the District Court of the Hague ruled earlier this year that the Dutch government\u2019s failure to adequately implement national mitigation targets contributed to a violation of Article 8 of the ECHR. Similarly, in the pending Community Law and Mediation Centre and others v. Ireland [re CAP24]<\/em><\/a>, the plaintiffs argue that the GHG emissions reduction roadmap laid down by the Irish government in its 2024 climate action plan is inconsistent with the country\u2019s overarching mitigation obligations, thus violating their fundamental rights. In Greenpeace, Germanwatch et al v. Germany [re transport sector]<\/em><\/a>, another pending case, the plaintiffs flag Germany\u2019s failure to\u00a0properly implement its mitigation targets for the transport sector, and to overall align its transportation policies with the country\u2019s remaining national carbon budget. The plaintiffs argue that unfairly offloading mitigation burdens to the future will lead to a failure to uphold constitutionally protected human rights.<\/p>\n

These cases suggest that human rights frameworks are functioning as a way to confront climate inaction before the courts with greater regularity, reflecting a deepening integration of rights-based considerations in implementation litigation. The cases from the Netherlands, Ireland, and Germany above, moreover, all build to some extent on the KlimaSeniorinnen<\/em> ruling, which marked a significant step forward in linking implementation adequacy to rights protection under the ECHR.<\/p>\n

Strengthening implementation litigation through expert evidence and monitoring<\/h2>\n

Across implementation litigation, scientific findings and expert evidence are often a key point of contention. Understanding how national judiciaries are approaching evidentiary hurdles is thereby essential to bolstering legal arguments and enhancing the prospects of success of these types of cases.<\/p>\n

The international and regional findings mentioned above require States to provide evidence of a due diligence approach in the delivery of their mitigation commitments. Such a procedural obligation to provide evidence of implementation planning and progress is thus a strong tool for enhancing judicial oversight of States\u2019 climate action. The court in KlimaSeniorinnen<\/em>, for instance, explicitly requires governments to \u201cprovide evidence showing whether they have duly complied, or are in the process of complying, with the relevant GHG reduction targets.\u201d Although this \u00a0clearly places an evidentiary burden on the government \u2013 and is likely to establish a strong foundation for implementation litigation \u2013 domestic courts may still expect plaintiffs to carry out an increasingly comprehensive engagement with scientific findings. Accordingly, ad hoc<\/em> expert evidence could still play a pivotal role in scrutinizing implementation, especially when such evaluation requires a thorough assessment of compliance across diverse and complex planning and regulatory instruments.<\/p>\n

The case of Friends of the Irish Environment v. Government of Ireland [re CAP23]<\/em><\/a> illustrates this dynamic. There, the plaintiffs argued that the government\u2019s 2023 Climate Action Plan was inconsistent with the country\u2019s overall legally binding mitigation targets, lacking sufficient specificity. The High Court dismissed the case in 2025, concluding that, based solely on what was apparent from the plan itself, the plaintiffs did not discharge the onus of proof and were expected to undertake an even more \u201cgranular\u201d analysis of the plan and its supporting materials (para. 134). In dismissing the appeal, the Court of Appeal further held<\/a> in 2026 that \u201cwhere the material in question is overwhelmingly technical and scientific in nature, it is likely that expert evidence will be necessary to establish the applicant\u2019s contention\u201d (para. 117).<\/p>\n

As national climate governance grows in sophistication, these conclusions indicate that courts may be inclined to apply a more exacting evidentiary standard where governments have demonstrated prima facie<\/em> compliance with their procedural requirements. Accordingly, in these instances plaintiffs may need to engage more substantively with scientific findings to demonstrate implementation failures.<\/p>\n

Looking ahead, as strong evidence is crucial to show flaws in government implementation planning and progress, the work of regional and national climate bodies is expected to gain increasing prominence in highlighting these gaps in legal proceedings. At the domestic level, for instance, assessments from national scientific bodies have already served as key evidence in successful implementation cases, including Ireland\u2019s Climate Change Advisory Council in FIE <\/em>and the UK\u2019s Climate Change Committee in FOE II<\/em>.<\/p>\n

At the regional level, the European Scientific Advisory Board on Climate Change has warned that existing sectoral shortcomings from individual Member States are set to undermine the achievement of European Union-wide mitigation goals. In a 2024 report<\/a>, it highlighted \u201cimplementation gaps\u201d and \u201cpolicy inconsistencies\u201d across the Union, recommending Member States to urgently ensure a rapid, robust, and effective implementation of climate policies at the national level. In this context, it also recommended that the European Commission take legal enforcement action towards Member States, where necessary.<\/p>\n

Although a growing number of countries<\/a> around the world have set up national climate bodies to help ensure<\/a> that their domestic policies align with their international climate commitments and the best available science, this practice is not yet ubiquitous. And while the independence and authority of these bodies vary by mandate, their importance is already evident in the ongoing implementation of the KlimaSeniorinnen<\/em> judgment. In September 2025, the Committee of Ministers of the Council of Europe (CoE), which oversees the implementation of ECtHR rulings, \u201cinvited<\/a>\u201d Switzerland to draw from good practices and establish a national climate body \u201cto monitor its climate policy\u201d and \u201cissue recommendations to the political authorities\u201d (para. 5). The creation of an independent and effective climate body would thereby represent a tangible step towards the fulfilment of the judgment, although it would not in itself satisfy the requirement that Switzerland quantify a national carbon budget or otherwise in line with 1.5\u00b0C. More broadly, independent scientific bodies would bolster the monitoring and evidentiary support needed to identify policy gaps. This could, in turn, promote a mutually reinforcing relationship between institutional oversight and implementation litigation, strengthening both over time.<\/p>\n

Embedding climate commitments across government decision-making processes<\/h2>\n

Although project-based lawsuits exist outside of the traditional consideration of implementation cases, some judiciaries are starting to show that meeting domestic targets and international climate commitments requires coherence across government decision-making processes, particularly with regards to permitting. This trend is significant as it considerably broadens the scope of implementation scrutiny.<\/p>\n

For example, after a permit for a renewable wind farm was denied, the Supreme Court of Ireland in Coolglass Wind Farm Limited v. An Bord Plean\u00e1la<\/em><\/a> (2026) confirmed that planning authorities have a legal obligation to assess that any decision to grant or refuse project permissions is consistent with the goals of Ireland\u2019s climate law. In quashing the permit denial and mandating consistency between national climate goals and public decision-making processes, the judgment will likely have broad implications for the conduct of public authorities in the country. Reflecting this wider significance, media coverage<\/a> has characterised the ruling as one that \u201cputs every public servant in Ireland on notice.\u201d<\/p>\n

Elsewhere in the common law ecosystem, Climate Clinic Aotearoa v. Minister of Energy<\/em><\/a> (2025) challenged the granting of petroleum exploration permits in the Taranaki region. New Zealand\u2019s Supreme Court determined that climate change is a mandatory relevant consideration because the country \u201chas entered into binding international commitments which require drastic reduction of its greenhouse gas emissions\u201d (para. 87). Although it dismissed the student-led<\/a> plaintiffs\u2019 appeal, the Court\u2019s jurisprudence has implications<\/a> for future cases as decision-makers must, in certain circumstances, take into account New Zealand\u2019s 2050 target, emissions budget, and emissions reduction plans when considering permits.<\/p>\n

Finally, two ongoing cases in Brazil further illustrate this trend. In Instituto Arayara v. Adasa and Termo Norte Energia Ltda (Water Resource Concessions and Installation of a Thermal Power Plant)<\/em><\/a>, a federal court in Brasilia suspended licenses issued to a thermoelectric plant in 2025 partly on the grounds that they were inconsistent with the country\u2019s NDC. The decision was upheld at the appeals level in March 2026. Similarly, in Instituto Preservar, AGAPAN and N\u00facleo Amigos da Terra vs. Federal Union and others (Climate emergency in Rio Grande do Sul state)<\/em><\/a>, a Porto Alegre federal court in 2025 ordered the suspension of licenses for a mine and coal plant and reaffirmed<\/a> that, as established in the aforementioned PSB<\/em> case, the Paris Agreement has supranational status. Accordingly, the long-term temperature limit of the treaty represents a \u201cbinding normative guideline for all public officials at the domestic level,\u201d with NDCs serving as \u201ca legally binding mechanism\u201d (page 117, unofficial translation).<\/p>\n

These developments illustrate the expansive nature of operationalizing climate commitments and point towards a growing sophistication of implementation litigation. Moreover, when taken as a whole, this evolving jurisprudence appears capable of affecting both sides of global mitigation efforts in that it could facilitate the approval of licenses for renewable energy initiatives as well as supporting the denial of fossil fuel projects incompatible with domestic targets and the Paris Agreement.<\/p>\n

Conclusion<\/h2>\n

As this two-part post has shown, jurisprudence from international, regional, and domestic courts has firmly established that governments have implementation obligations to monitor progress, meet their targets, and adopt transparent and achievable plans in line with their pledges. Recent judgments and pending cases further show that implementation litigation is highly effective in addressing States\u2019 failure to faithfully implement their climate obligations. Plaintiffs are relying on strong precedents and increasingly sophisticated pleadings to counter regression and ensure that climate commitments are integrated vertically across decision-making processes. To do so, human rights arguments appear central, as is the need for granular expert evidence. These trends illuminate the capacity of implementation litigation to respond to shifting legal and political conditions while also strengthening oversight and accountability across jurisdictions.<\/p>\n

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This is the second of two posts exploring the evolution of climate change implementation litigation. Part I detailed how governments\u2019 duties to monitor and meet their climate commitments, and have transparent and attainable climate plans, are well-defined by international, regional, and domestic courts. 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