I'm interested in any historical examples people have of altruistic actions taken primarily to benefit future generations, which don't have strong positive effects for current generations. (So e.g. most climate change mitigation efforts wouldn't count, if we expect climate change to have a big negative impact on people currently alive - but maybe some do?)
https://en.wikipedia.org/wiki/Long-time_nuclear_waste_warning_messages
The Wikipedia article seems to only cover the conceptual idea, and I remembered that there has been a concrete implementation, too. After a short google, I found at least this Atlantic article:
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