Volunteer.  For every action should be a voluntary action.  Your will.  Through will things get accomplished, by nothing else can anything be done.  No incentive is required of any being.  No being must do anything.  If our society is configured properly, beings will gravitate to a specialty they choose to exercise.  When not, rest on this pleasure planet is our reward for existence.  A parent does not pay a child to live, a child does not pay a parent to live.  Since we are all parents to the children of the earth, it is time to start acting like it instead of the greedy monsters we have allowed humans to become.  Voluntarily choose to care for the children of earth and the children of earth will voluntarily choose to care for you.