{"id":28877,"date":"2026-06-16T09:00:30","date_gmt":"2026-06-16T07:00:30","guid":{"rendered":"https:\/\/voelkerrechtsblog.org\/?p=28877"},"modified":"2026-06-19T13:49:52","modified_gmt":"2026-06-19T11:49:52","slug":"fair-share-in-greenpeace-bonaire","status":"publish","type":"post","link":"https:\/\/voelkerrechtsblog.org\/de\/fair-share-in-greenpeace-bonaire\/","title":{"rendered":"Fair Share in Greenpeace Bonaire"},"content":{"rendered":"

Both the ICJ<\/u><\/a> and the ECtHR<\/u><\/a> have recognized 1.5\u00b0C with no or limited overshoot as the relevant benchmark for assessing states\u2019 climate obligations.\u00a0At the same time,\u00a0climate litigation aimed at mitigation of greenhouse gases\u00a0unfolds against persistent disagreement over the fair share question: how should the remaining global carbon budget (GCB)\u00a0compatible with limiting warming to 1.5\u00b0C\u00a0be fairly allocated\u00a0among states?\u00a0Domestic courts contribute to the operationalization of this question as they review the adequacy of state mitigation efforts.\u00a0Yet as\u00a0the remaining GCB\u00a0continues to shrink<\/u><\/a>,\u00a0the tension sharpens: between\u00a0what science indicates is required to remain within the 1.5\u00b0C objective, and what courts may demand of political institutions within the limits of judicial review and separation of powers.<\/p>\n

The recent Greenpeace Netherlands v. The Netherlands<\/em> (<\/em>Greenpeace Bonaire<\/em><\/u><\/a>)<\/em> case\u00a0makes this\u00a0tension\u00a0concrete. Addressing claims that inadequate climate policies violate human rights, it is the first domestic\u00a0judgement to operationalize the ECtHR\u2019s merits standards in\u00a0KlimaSeniorinnen<\/em><\/u><\/a>,<\/em><\/u>\u00a0<\/em>and one of the first since the ICJ issued its\u00a0Advisory Opinion on climate change<\/u><\/a>. An earlier <\/u>contribution<\/u><\/a>\u00a0described the judgement as\u00a0\u201cdialogical\u201d: the District Court balances the urgency of mitigation with judicial restraint by\u00a0foregrounding\u00a0procedural and justification\u00a0duties, while referring the substantive\u00a0determination of revised targets and measures back to the state.<\/p>\n

This contribution highlights how\u00a0that judicial strategy, and the substantive discretion it preserves,\u00a0interacts with scientific insights reflected and not reflected in the judgment. It argues that, if states are to meet their international commitment to the 1.5\u00b0C target with no or limited overshoot, climate science shows that this discretion is already significantly constrained.<\/p>\n

How to Fairly Allocate the Remaining Global Carbon Budget?<\/strong><\/p>\n

The fair share debate fundamentally\u00a0underlies\u00a0domestic mitigation cases, as courts delineate the scope of discretion afforded to states in implementing their climate obligations. While international law does not prescribe a single allocation formula, it requires states to exercise \u201cstringent due <\/u>diligence<\/u><\/a>\u201d in implementing mitigation measures capable of contributing to the 1.5\u00b0C objective, in accordance with applicable equity principles, including common but differentiated responsibilities and respective capabilities (CBDR-RC), equity, and sustainable development (\u00b6\u00b6245-249).<\/p>\n

In turn, effort-sharing studies translate different ethical approaches to burden-sharing<\/u><\/a>\u00a0into quantitative allocations of the remaining\u00a0GCB, whose size depends on\u00a0estimated cumulative emissions compatible with the 1.5\u00b0C target under various modeling assumptions including\u00a0the probability threshold, starting date and non-CO\u2082 emissions.<\/p>\n

A state\u2019s \u201cfair share\u201d\u00a0refers to an allocation that reflects the equity principles of international law. A<\/u> distinction can <\/u>accordingly <\/u>be <\/u>made<\/u><\/a>\u00a0between effort-sharing approaches that do not reflect the equity principles of international law \u2013 including grandfathering, which allocates emissions relative to current emission levels and cost-effectiveness \u2013 and\u00a0approaches that do.\u00a0These include responsibility, capability, sustainable development and, more controversially, equal per capita allocations. The former\u00a0preserve comparatively larger shares of the remaining carbon budget for historically high-emitting states.\u00a0The latter allocate comparatively greater mitigation burdens to high-emitting developed states, crucially indicating that most have already exhausted their fair share<\/u><\/a> of the remaining GCB\u00a0or are close to doing so<\/u><\/a>.<\/p>\n

Justification Duties and the Space Left to the State<\/strong><\/p>\n

A Procedural Remedy with Substantive Dimensions<\/strong><\/em><\/p>\n

The\u00a0present case\u00a0concerns Bonaire, a Caribbean island forming part of the Netherlands as a special municipality within the Kingdom of the Netherlands. Greenpeace <\/u>argued<\/u><\/a> that the Netherlands failed to adequately protect Bonaire from the adverse effects of climate change, owing to insufficient mitigation and adaptation measures, and discriminatory treatment of its inhabitants. The District Court found violations of Article 8 ECHR and related non-discrimination provisions (\u00b6\u00b612.1-12.3).\u00a0On mitigation, it ordered the State to revise its climate policy within eighteen months, requiring adequately justified, economy-wide\u00a0interim\u00a0reduction targets for the period up to 2050 compatible with international law and a clear account of how its remaining emission\u00a0space relates to the remaining\u00a0GCB (\u00b612.2).<\/p>\n

Echoing KlimaSeniorinnen<\/em>\u00a0<\/em>(\u00b6543), in light of the 1.5\u00b0C limit, the Court recognized a reduced margin of appreciation regarding the need and the stringency of climate\u00a0objectives, and a wider margin regarding the choice of measures, provided these are reasonably capable of achieving set objectives and are actually implemented (\u00b6\u00b610.21-10.22). Although framed as procedural, these obligations can be understood as having \u201csubstantive dimensions<\/u><\/a>\u201d,\u00a0insofar as they must be jointly capable of staying below 1.5\u00b0C (ICJ AO <\/em>\u00b6245).<\/p>\n

The 43% Benchmark as a Trigger for Justification<\/em><\/strong><\/p>\n

Throughout the judgement, the Court relies on an IPCC AR6 <\/u>WIII<\/u><\/a>\u00a0benchmark calling for a 43% reduction in global greenhouse gas emissions by 2030 relative to 2019 levels, emphasizing its international endorsement in the First Global <\/u>Stocktake<\/u><\/a>\u00a0<\/em>and the Sharm el-Sheikh Implementation Plan<\/u><\/a>.\u00a0This reflects a broader trend of using\u00a0formally non-binding international instruments to interpret the scope of states\u2019 mitigation obligations\u00a0and\u00a0<\/u>a<\/u> wider pattern in European climate adjudication<\/u><\/a> of grounding scientific credibility in international political and scientific consensus.<\/p>\n

Unlike in Urgenda<\/u><\/a>, the\u00a0District Court treats the benchmark not as a reduction floor but as a reference point, triggering a need for justification where lower domestic emission reductions are pursued (\u00b611.13.5).\u00a0It further considers that such lower reductions do not in themselves violate\u00a0Article 8 ECHR, but may weigh as a negative factor in its overall assessment, particularly where\u00a0relying on contested allocation methods such as grandfathering<\/u><\/a>. States may defend them by providing additional mitigation or adaptation support to other states, provided that the overall policy is adequately justified as sufficient and equitable under international law (\u00b611.13.4).<\/p>\n

In principle, this reasoning\u00a0allows\u00a0lower\u00a0domestic emission reduction\u00a0targets\u00a0to be justified through reductions abroad and potentially through carbon dioxide removal (CDR), although not\u00a0explicitly addressed by the Court.\u00a0Neither does the Court specify to what extent such measures may substitute for feasible domestic reductions, or when such reliance would be compatible with international equity standards.\u00a0More fundamentally,\u00a0it leaves unaddressed that such\u00a0reliance on substitutability is already constrained by what climate science indicates is required to remain within the 1.5\u00b0C limit.\u00a0It\u00a0increases the risk of overshoot while shifting the burden of mitigation and overshoot management to other states and future generations.<\/p>\n

Carbon Budgets and the Problem of Alternatives<\/strong><\/em><\/p>\n

A related point concerns the Court\u2019s treatment of carbon budgeting. The District Court treats the requirement in KlimaSeniorinnen<\/em>\u00a0<\/em>that states must quantify emission limits \u201cthrough a carbon budget or otherwise\u201d (\u00b6573) as methodologically open\u00a0(\u00b611.15.2). Yet\u00a0Strasbourg\u2019s reasoning\u00a0arguably points to<\/u><\/a> a more constrained understanding, in which alternative forms of quantification must meaningfully capture a state\u2019s fair share of the remaining GCB. The District Court does not engage with whether alternative formulations can meet that standard in light of climate science.<\/p>\n

Limits of the 43% Benchmark<\/strong><\/p>\n

The 43% <\/u>benchmark<\/u><\/a>\u00a0marks the median\u00a0reduction target\u00a0globally required by\u00a02030, compared to 2019 emissions levels,\u00a0to\u00a0remain\u00a0on a pathway consistent with the remaining GCB\u00a0for a >50% likelihood of limiting warming to 1.5 \u00b0C with no or limited overshoot. It is accompanied by\u00a0the warning that further delaying reductions\u00a0until 2030 would make it virtually impossible to stay within this budget without heavy and uncertain reliance on CDR.<\/p>\n

A Global Average, Not an Equitable National Benchmark<\/strong><\/em><\/p>\n

Crucially, this global average\u00a0is not an equitable benchmark for high-emitting developed states such as the Netherlands. As the District Court acknowledges, the equity principles of international law\u00a0require so-called developed, high-emitting countries\u00a0to take the lead in reducing emissions\u00a0(\u00b611.13.5.).\u00a0Regardless of how the State formally specifies its remaining emission space, effort-sharing accounts reflecting these principles indicate that high-emitting states have already exceeded, or are close to\u00a0exceeding, their fair\u00a0share of the GCB.\u00a0Delaying or displacing feasible domestic reductions thus relies on emission space that, on many\u00a0effort-sharing accounts, has already been exhausted.<\/p>\n

How\u00a0Further Delay Changes the Equation<\/strong><\/em><\/p>\n

Since the IPCC figure was endorsed in 2022, global emissions have continued to exceed the levels assumed in the underlying pathways. More r<\/u>ecent analyses<\/u><\/a>\u00a0estimate that the remaining GCB is 130 GtCO\u2082 from 2025 for a 50% chance of limiting warming to 1.5\u00b0C, likely to be exhausted before 2030 at current rates.\u00a0Emission targets are pathway dependent: the same 2030 reduction can yield very different cumulative emissions depending on interim emissions. A 43% reduction by 2030 may therefore no longer suffice to remain within a 1.5\u00b0C-consistent GCB.\u00a0Consequently, the flexibility preserved by the Court is narrower than the benchmark, viewed in isolation, suggests.<\/p>\n

The Limits of Substitution: Science and Fairness\u00a0<\/strong><\/p>\n

The Shrinking Space for Mitigation Abroad<\/em><\/strong><\/p>\n

Geophysically, limiting warming to 1.5\u00b0C\u00a0depends on cumulative emissions; not where<\/em> reductions occur first. In principle, therefore, financing or facilitating reductions abroad could\u00a0offset slower domestic reductions.\u00a0Yet as global emissions continue to rise, this compensatory space is rapidly vanishing: the more states\u00a0accumulate carbon debt<\/u><\/a>, the further the remaining GCB shrinks and, with it, the scope for offsetting excess domestic emissions through mitigation abroad. This creates risks of competition for the same limited reductions space abroad,\u00a0and of overshoot where multiple states rely on foreign emission reductions without coordination. Reductions abroad\u00a0further raise\u00a0concerns of double-counting and transparency<\/u><\/a>, and\u00a0equity concerns\u00a0where they concentrate\u00a0in developing countries, potentially imposing local burdens without <\/u>comparable<\/u>\u00a0<\/u>benefits<\/u><\/a>, and constraining emission space tied to development opportunities.<\/u><\/a><\/p>\n

The Limited Space for Removals<\/strong><\/em><\/p>\n

It does, however,\u00a0matter when<\/em> reductions occur.\u00a0If the GCB for 1.5\u00b0C is exceeded before reaching net zero, temperatures will temporarily overshoot and can only be brought back through sustained net-negative CO\u2082 emissions thereafter. Overshoot<\/u><\/a>\u00a0increases risks to human and natural systems, including the likelihood of crossing irreversible tipping points, which increase\u00a0according to its magnitude and duration.\u00a0This has<\/u> distributional <\/u>consequences<\/u>,<\/u>\u00a0<\/u><\/a>as impacts fall disproportionately on regions which have historically contributed least to cumulative emissions and are more vulnerable to climate impacts due to, inter alia, their geographical position and limited resources.\u00a0Consequently, pathways for 1.5\u00b0C with no or limited overshoot require rapid emission reductions in the near-term, and restrict\u00a0CDR before net zero to\u00a0balancing residual emissions, with larger scale deployment only thereafter (IPCC<\/u><\/a> C.1-C.3; European Scientific Advisory Board on Climate Change<\/u><\/a>, pp. 30-40).<\/p>\n

This matters because\u00a0developed states\u2019 mitigation strategies already imply large-scale reliance on carbon dioxide removal<\/u><\/a>.\u00a0Where a state relies on CDR as a substitute for feasible domestic mitigation, this increases the risk of overshoot or irretrievable carbon debt\u00a0for three interrelated reasons.\u00a0First, the global mitigation requirement remains unchanged. Where a state undertakes fewer domestic reductions, the corresponding reduction burden must be assumed by other states in the near term. Second, because rapid near-term emission reductions remain necessary, large-scale substitution through future removals is incompatible with a shrinking carbon budget. Like with mitigation abroad, there is only limited space for states to substitute short-term reductions with CDR.\u00a0Third, maintaining the same global pathway would require the state to rely on higher levels of CDR, either before or after reaching net zero, to offset the resulting increase in its net emissions. Yet the effectiveness, potential, risks, costs and scale at which CDR can be deployed are<\/u> still highly uncertain<\/u><\/a>. Currently, the only widely practiced CDR is a limited set of mainly land-based methods – which are ironically declining because of the consequences of climate change.<\/p>\n

What the Court Leaves Open<\/strong><\/p>\n

Ultimately, the Court\u2019s procedural,\u00a0\u201cdialogical\u201d approach, while preserving institutional balance,\u00a0leaves key questions unresolved. These will likely reemerge if the State\u2019s revised targets are challenged: with\u00a0what standard and intensity of review should courts review pathways that substitute feasible domestic reductions with more uncertain alternatives? And how should courts interpret and evaluate the climate science on which such assessments depend, including\u00a0uncertainties in modelling, scalability, and long-term effectiveness?\u00a0More fundamentally, if 1.5\u00b0C is exceeded,\u00a0courts may face questions relating to net-negative emissions, loss and damage, and responsibility for overshoot. Compensation claims alleging that states have exceeded their fair share would then expose a prior difficulty: how can courts assess responsibility for fair share exceedance, if they have not first specified the mitigation efforts required to remain within it? The judgment thus postpones questions that a shrinking carbon budget will make increasingly difficult to avoid.<\/p>\n","protected":false},"excerpt":{"rendered":"

Both the ICJ and the ECtHR have recognized 1.5\u00b0C with no or limited overshoot as the relevant benchmark for assessing states\u2019 climate obligations.\u00a0At the same time,\u00a0climate litigation aimed at mitigation of greenhouse gases\u00a0unfolds against persistent disagreement over the fair share question: how should the remaining global carbon budget (GCB)\u00a0compatible with limiting warming to 1.5\u00b0C\u00a0be fairly […]<\/p>\n","protected":false},"author":35,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6639],"tags":[3792,7812,7056],"authors":[8021],"article-categories":[6000],"doi":[],"class_list":["post-28877","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-climate-change","tag-climate-change-advisory-opinion","tag-the-netherlands","authors-renske-natte","article-categories-article"],"acf":{"subline":"Substantive Discretion Under a Shrinking Global Carbon Budget"},"meta_box":{"doi":"10.17176\/20260616-190040-0"},"_links":{"self":[{"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/posts\/28877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/users\/35"}],"replies":[{"embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/comments?post=28877"}],"version-history":[{"count":3,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/posts\/28877\/revisions"}],"predecessor-version":[{"id":28889,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/posts\/28877\/revisions\/28889"}],"wp:attachment":[{"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/media?parent=28877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/categories?post=28877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/tags?post=28877"},{"taxonomy":"authors","embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/authors?post=28877"},{"taxonomy":"article-categories","embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/article-categories?post=28877"},{"taxonomy":"doi","embeddable":true,"href":"https:\/\/voelkerrechtsblog.org\/de\/wp-json\/wp\/v2\/doi?post=28877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}