Question: how many tons of nuclear waste in the world?
Answer: In 2010, it was estimated that about 250,000 tons of nuclear HLW were stored globally. This does not include amounts that have escaped into the environment from accidents or tests. Japan is estimated to hold 17,000 tons of HLW in storage in 2015. As of 2019, the United States has over 90,000 tons of HLW.