For more than half a century, the atoll, which is part of the Marshall Islands, has been contaminated by nuclear explosions and waste, according to ABC Australia. The decades ahead could leave it submerged by rising sea levels.
In this way, Enewetak “is at the intersection of two of the biggest problems of the last century and this century, nuclear weapons and sea level rise,” Michael Gerrard, the chair of Columbia University’s Earth Institute in New York who has studied the atoll, told Global Citizen.
Both of these problems are at risk of converging, ABC Australia reported, because the main holding container for the atoll’s nuclear waste is being compromised by rising waters.
The atoll’s problems began in the 1940s and 1950s when the U.S. began using it for nuclear bomb tests. The people of Enewetak were evacuated and 67 nuclear bombs were dropped, devastating wildlife, spreading nuclear toxins far and wide, and creating massive craters.
One of those craters was on Runit Island. In the late 1970s, the U.S. began to partially clean the nuclear waste from the island. Some of the radioactive chemicals had relatively short half-lives, Michael Gerrard wrote in an op-ed, and were left to naturally decay despite their risks. Another toxin, plutonium-239, has a half-life of 24,000 years and had to be dealt with.
The 100-meter wide crater on Runit Island was deemed a good place to dump as much soil contaminated with plutonium as possible. Chunks of unexploded plutonium-239 were also disposed of in the hole.
When the cleanup was finished—far below standards that would be deemed sufficient in the U.S., according to Gerrard—a massive concrete shell was built to cover the hole.
No reinforcements were made to the bottom and sides of the hole, meaning the waste directly interacts with the soil and a dumpsite for radioactive waste fails to meet standards for normal trash landfills, Gerrard said.
The displaced people of Enewetak Atoll were finally allowed to return in 1980, despite the widespread contamination of their home. Traditional forms of fishing, farming and gathering had to be abandoned because the wildlife became too contaminated, ABC Australia reported.
And despite the ongoing threat posed by the non-reinforced radioactive dumpsite, no adjustments have been made to it, ABC noted. That’s because the radiation outside the dome exceeds the radiation inside of it, according to the U.S. Department of Energy report, so the release of the waste wouldn’t make a major environmental difference.
“That dome is the connection between the nuclear age and the climate change age,” Marshall Islands climate change activist Alson Kelen told ABC Australia.
“It’ll be a very devastating event if it really leaks,” he said. “We’re not just talking the Marshall Islands, we’re talking the whole Pacific.”
The threat faced by Enewetak reflects a larger nuclear threat around the world, Gerrard said.
Globally, nuclear power facilities are generally built along coastlines, because of how much water they use and to be close to cities and towns.
The destruction of the Fukushima nuclear reactor in Japan made clear just how precarious this arrangement can be—six years after the disaster, nuclear waste is still pouring out of the facility.
Rising sea levels could put other reactors and dump sites around the world at risk, especially if extreme weather continues to intensify as expected.