Since its inception, nuclear energy has faced a host of opposition, from oil conglomerates to well-intentioned anti-nuclear-weapons activists to environmental groups. As it turns out, even ocean critters are getting in on the movement.

Four reactors at France’s Gravelines nuclear power plant were shut down late Sunday due to a swarm of jellyfish in the cooling systems, operator EDF said on Monday, likely due to rising water temperatures because of global warming.

Since at least the 1990s, nuclear power plants across the world have been forced to shut down due to jellyfish getting clogged in their cooling system. Such incidents are now on the rise as climate change and marine pollution have increased the jellyfish population.