Summary:
In June 2023, an adaptation case was filed in Belgium against the Brussels-Capital Region (RBC) before the Francophone Court of First Instance of Brussels. The case was brought by 1330 individuals and by the NGO We Are Nature.Brussels, a Brussels-based organisation dedicated to protecting biodiversity, natural areas, undeveloped areas, abandoned sites, and living soils within the RBC. The plaintiffs emphasized the right to life in Article 2 ECHR and the right to respect for private and family life in Article 8 ECHR to argue that the region’s government had violated its duty of care to adapt to climate change by failing to adapt to the risks of flooding or urban heat islands. On 29 October 2025, Judge Sabine Malengreau for the Court of First Instance found that the RBC had indeed violated its legal obligations under domestic law, ordering the suspension of further urbanization and soil sealing projects on undeveloped sites larger than 0,5 hectares. Although the case is subject to appeal, it is provisionally enforceable.
The first instance court’s reasoning in more depth:
On the admissibility of the case, the court considered the reasoning of the European Court of Human Rights (ECtHR) in KlimaSeniorinnen as concerns victim status and standing. The RBC’s government had invoked this judgment to argue that, like in the ECtHR proceedings, the individual applicants in the present case also lacked victim status because they had failed to demonstrate that they were personally and directly affected by the violations they alleged. The court rejected this argument. It held that this reasoning from the ECtHR was not relevant to the case before it given that the ECtHR determines victim status based on the autonomous conception of that term under Article 34 ECHR, whereas the conditions for liability under Belgian law “may validly differ from the conditions for the admissibility of an application filed within the framework of a system of remedies and procedures designed to ensure the ECtHR’s oversight of compliance with the ECHR.” It went on to declare the claims by the individual plaintiffs, all residents of Brussels, admissible.
In her reasoning, which noted the judgment in Belgium’s Klimaatzaak mitigation case, Judge Malengreau established a violation of the RBC’s duty of care because of its failure to act with the prudence and diligence required by Article 1382 of the former Belgian Civil Code. Previously, in the Klimaatzaak, two successive instances of the Belgian judiciary had already established that the RBC’s climate policy violated Articles 2 and 8 ECHR given that it had failed to take appropriate and reasonable measures to do its part in meeting the minimum requirements for reducing GHG emissions between 2013 and 2020.
Building on this reasoning, as well as obligations under the Paris Agreement and under EU law, the court noted (own translation from the original French):
- RBC’s failure resulting from its inadequate goals and results in terms of mitigating GHG emissions;
- the lack of an updated estimate of the capacity of natural sinks to absorb GHG emissions at the regional level;
- the steady increase in urbanization and soil sealing;
- the inadequacy of current regulatory tools;
- and this, in a context where, for more than fifteen years, the RBC was aware of the certain risk of climate change that is dangerous to the region’s population and of the urgency of preventing the inevitable harmful effects of this climate change.
The court went on to find that:
Indeed, the aforementioned findings do not support the conclusion that RBC took the necessary measures to maintain and strengthen the capacity of natural sinks to absorb GHG emissions, even though it knew, as early as 2017, that, as things stood, the absorption capacity was largely insufficient relative to direct GHG emissions and that it was essential to strengthen natural sinks both to mitigate climate change and to adapt to its adverse effects.
In terms of establishing damage, the court held that:
None of the individual plaintiffs is immune to the negative effects (heat waves, droughts, floods, etc.) of climate change, which, in one way or another, is manifesting itself throughout the Brussels region.
It is also established that, regardless of efforts to mitigate the causes of global warming, its harmful effects will continue to multiply and worsen in the short and medium term.
To remedy this violation, the plaintiffs sought a moratorium on development and soil sealing on undeveloped sites larger than 0.5 ha.
The court noted that this would have the effect of regulating the use of land belonging to public and private actors, which would constitute an interference with property rights as guaranteed by Article 16 of the Belgian Constitution and Article 1 of the Protocol No. 1 to the ECHR. It was accordingly not within the court’s authority to limit the exercise of the right to property by a broad and undefined range of public or private entities that were not parties to this case. Specific measures were accordingly left to the discretion of the RBC, which was ordered to take the necessary measures to suspend development and soil sealing of undeveloped sites and parcels of land larger than 0.5 ha within its jurisdiction, until the adoption of the PRAS amendment, or (as a back-up deadline) 31 December 2026.
The judgment:
The full text of the first-instance judgment (in the original French) is available below.
More information:
Additional information on the case, including press releases, are available here.
Suggested citation:
Francophone Court of First Instance of Brussels, We Are Nature.Brussels and others v. Brussels-Capital Region, case nr. 24/885/A, judgment of 29 October 2025.
Last updated:
23 July 2026.

