As soon as the project was made public, it was attacked for its negative environmental impact and the nuisances it would cause for the nearby inhabitants. A citizen movement called Collectif Non au Terminal 4 was created. Local associations and inhabitants, as well as environmental activists, joined the fight. The mobilisation included online posts, protests, and petitions. On the 3rd October 2020, around 350 activists protested peacefully in the airport, and 87 managed to go on the tarmac [6]. Some were arrested and their trials are pending [4].

Numerous arguments were brought against the project. First, the new terminal would increase the emissions of the airport by 15 millions tons of CO2e [6]. The aviation sector is already responsible for 5,9% of the current greenhouse gas emissions so a decrease in air traffic is necessary to reduce the impact of climate change [9]. Second, the airport as it currently is would be able to absorb the projected increase of air traffic without any problem, so that it would not be overloaded when the new terminal would start to operate [3]. Third, nearby residents would suffer from an increase in pollution and sound nuisance.

On the 11th of February 2021, the French government decided to abandon the project, judging it as "obsolete" regarding its environmental impact and the decrease of air travel since the start of the covid pandemic [5]. Nevertheless, the government asked ADP to work on a new terminal project and stays in favor of a future increase of air traffic at Roissy airport [7].

The projects was criticised from the start for its ecological impact and the uncertain future of the aviation sector.