algha: Arable Land In Gigahectares (gha)
Variable
World3 03 indicators sector
Arable Land In Gigahectares (gha) [Ghectares]
algha = al / hpgha

algha in the updating graph: ( how to read )
In nodes
al : Arable Land
hpgha : ha per Gha
Out nodes
hef : Human Ecological Footprint