In an ancient wood in Hampshire, a county in southern England, construction workers are felling trees and clearing stumps. Over the workers’ shoulders, ecologists check to make sure that no bats or bird’s nests are being disturbed. They are building a road that will eventually lead to 160 hectares of grassland where Portsmouth Water, the utility company that manages the water supply here, is going to build a reservoir.
The reservoir will sit in a clay valley, and so its water will naturally be sealed from the surrounding woodland. Portsmouth Water expects to fill it using nearby springs by 2029. If all
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