Genetically modified crops and rope: what they have in common

1. Step 1. Genetically modified crops — uses — Mineral fertilizer. Intensive farming combines varieties and fertilizers.
2. Step 2. Mineral fertilizer — evolved from — Crop rotation. Fertilizers solved the problem of fertility that crop rotation used to solve.
3. Step 3. Crop rotation — uses — Plough. The three-field system with a heavy plough.
4. Step 4. Plough — uses — Wedge. The ploughshare parts the soil like a wedge.
5. Step 5. Wedge — is used in — Harpoon. A barbed point enters like a wedge and does not come back out.
6. Step 6. Harpoon — has part — Rope. A line connects the head to the hunter.

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