For millennia, this is the method we used to get food out of trees:
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So let's say the crop in question was olives. How would you mechanize the process? You could surely rig up something to shake the tree, but what about picking each and every olive off of the ground?
This was handled for nuts with the clever Multi-Headed Nut Wizard, but nuts are hard and olives are soft; the 'Wizard would crush the olives. So French agricultural machinery company Pellenc designed this rather brilliant system:
Perhaps Scott Pruitt could adapt the design to handle tree-climbing environmental activists.