In a recent decision, the French-speaking Court of First Instance in Brussels decided, at the request of the non-profit organisation Klimaatzaak, that the Belgian state and the three regions have failed to reduce greenhouse gas emissions. The court however did not impose on the governments to respect numerical objectives.

Five months later, on 17 November 2021, KlimaatZaak filed an appeal before the Court of Appeal of Brussels to require binding reduction targets to be imposed on governments, considering that the Belgian authorities have not taken the necessary steps.