Plough and data centre: what they have in common

1. Step 1. Plough — is used in — Crop rotation. The three-field system with a heavy plough.
2. Step 2. Crop rotation — evolved into — Mineral fertilizer. Fertilizers solved the problem of fertility that crop rotation used to solve.
3. Step 3. Mineral fertilizer — uses — Sulfuric acid. Superphosphate is made with sulfuric acid.
4. Step 4. Sulfuric acid — is used in — Lead–acid battery. The electrolyte.
5. Step 5. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
6. Step 6. Uninterruptible power supply — is part of — Data centre. Backup power.

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