An alternative could be where a coin could be directly proportional to a tree planted! Its value would go up as the tree grew bigger. Think of a carbon sink. While it would come with its own loopholes like having invasive plants. Its an interesting way to have an alternate. One could even expand to other similar sources which could aid to a better future.
A computer with that long lifespan will also help a lot of people with diseases such as Alzheimer's. Its becomes really hard to cope with the ever changing operating systems as one gets older.
