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?)
Maybe one could find examples of people saving important books in times of severe crises, where it’s clear that the books won‘t help with the rebuilding efforts that will fall on the current generations?