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More than 1km under the North Sea is a climate-friendly mineral that could help feed the world
Polyhalite is like a thick crumbly slate and is made up of potassium, magnesium, calcium and sulphur. These minerals all nourish crops, especially potatoes, vegetables and fruit.
The world we drive through is moon-dust grey: after a shift the workers gain a ghostly pallor and gear left unused for a few days acquires powdery drifts. But just as I slide into eerie sci-fi daydreams, we pass picnic tables crammed with day-glo miners devouring pasta and chicken from outsized lunchboxes. But inconveniently, the easiest access is in the middle of a National Park making some locals and planning officers very wary of big industrial developments and associated truck traffic.
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