African countries looking to invest in nuclear energy as a source of clean electricity should consider Europe’s struggles with disposing of radioactive waste.

Seventy years after the nuclear age began, no country has built a place to safely store its waste, a report published this week warns, raising concerns for governments mulling nuclear power as an alternative to fossil fuels.

More than 60,000 tons of highly radioactive waste in the form of spent nuclear fuel rods are stored in interim sites across Europe, according to the World Nuclear Waste Report, some in old facilities that are running out of capacity and are expected to be used for decades longer than planned.

Read more: Deutsche Welle