Planting for posterity
Every year I gather a dozen or so acorns and put them in pots for planting out two years later. It's such a simple thing to do and eventually becomes a habit, or rather a very enjoyable hobby, that is just one small task to remember each autumn.
I then spend a few hours finding spots to plant them in. Usually the chosen spots are gaps in hedgerows or bare corners at the edges of woodland. I find that staking them and protecting them with plastic tubes ensures the trees remain protected and are easy to find if briars are threatening to invade their space. I will never make money from these trees but someone will, even if it is 200 years from now.
When planting them, I am reminded of that lovely saying: "A nation grows great when men plant trees whose shade they know they will never sit under."