According to a new scientific study, a nuclear attack of 100 bombs could harm the entire planet including the aggressor nation. How so?

New research argues that 100 nuclear weapons is the “pragmatic limit” for any country to have in its arsenal. Any aggressor nation unleashing more than 100 nuclear weapons could ultimately devastate its own society, scientists warn.

The study was published in the journal Safety on Thursday; it was co-authored by Michigan Technological University professor Joshua Pearce and David Denkenberger, assistant professor at Tennessee State University and director of Alliance to Feed the Earth in Disasters (ALLFED).

“The results found that 100 nuclear warheads is adequate for nuclear deterrence in the worst case scenario, while using more than 100 nuclear weapons by any aggressor nation (including the best positioned strategically to handle the unintended consequences) even with optimistic assumptions (including no retaliation) would cause unacceptable damage to their own society,” the scientists wrote.