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Preferred locations are likely to include old industrial sites, such as former nuclear plants, or old coal mines close to the grid.

"These Earth observation programmes are our canary in the coal mine," he told BBC News.

Again, this is why the treatment of Black people in America is like the canary in the coal mine.

In the 20th century it had drawn much of its support from workers in the factories, coal mines, steel works and shipyards of industrial Britain.

The trust’s collapse, Knowlton said, was, “a canary in the coal mine situation.”