If I ruled the world... every town would have to set aside a proportional piece of land to be used as a park...and when people died they would be cremated and a tree planted with the ashes.
The more people died..the more they enhance the park.
You could also have a Family tree... because of the time a tree lives... additional family members could join you by scattering their ashes around a family tree....
No grave stones...but you could have a park bench with a memorial plate on...which would be helpful for visitors visiting the park....or a water dispenser with your name on it...useful things...kindness to others.
If I ruled the world....
(Id make cannabis compulsory for the over 40's too....

..)