> b) how to communicate to civilizations for the next 25000-50000 years what kind of waste that is. People care about this way more than it actually matters. I

> b) how to communicate to civilizations for the next 25000-50000 years what kind of waste that is. People care about this way more than it actually matters. If going near a certain area kills you, people are going to learn that after the first few deaths. The casualties are never going to anywhere near the stakes of global warming. And besides that, the whole worry only applies in the narrow range of futures where humanity neither drives itself extinct nor retains advanced technology. It occurs to me that in that kind of future, society might actually be helped overall by the scientific advancement driven by having access to radioactive sources.