It isn’t every project that requires people to make plans for thousands or
millions of years in the future. But some kinds of nuclear waste remain deadly
for over 250,000 years
[https://www.scientificamerican.com/article/nuclear-waste-lethal-trash-or-renewable-energy-source/]
, probably outliving all existing civilizations, languages, and possibly even
humanity itself.
![A 10,000 year warning](/content/images/size/w795/image/fetch/w_1200-c_limit-f_jpg-q_auto:good-fl_progressive:steep/https-3A-2F-2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com-2Fpublic-2Fimages-2Fdd43e246-cb8f-438c-99b3-533b196d75f7_500x393.png)