Some 40m beneath the Swedish countryside, near Oskarshamn on Sweden’s Baltic coast, lies decades worth of high-level nuclear waste: used nuclear fuel from the country’s reactors, highly lethal (this material is intensely radioactive) but entirely safe (because it sits beneath 8m of water, a very effective barrier against radiation). Waste can (and needs to) be kept like this for decades: intense radioactivity generates a great deal of heat, so this material has to be cooled for long periods before it can be removed for storage. What to do with it afterwards? A real concern for many governments, including the UK… Read more on