Although construction has begun, the project was not conceived by the Brazilian government for the event. The Extraordinary Secretariat for COP30 issued a press release on 13 March, stating that the project “does not fall under the responsibility of the federal government [Brazil’s central state] and is not one of the 33 infrastructure projects planned for COP30”. It deplored the fact that press articles had “wrongly suggested a link between the construction project and the federal government’s actions in the run-up to the conference”.
Apparently it’s been planned since 2012. From Reporterre (in French)
Translated with DeepL