A simple "like" sent from our smartphones mobilizes what will soon constitute the largest infrastructure built by man. This small notification, crossing the seven operating layers of the Internet, travels around the world, using submarine cables, telephone antennas, and data centers, as far as the Arctic Circle.

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It turns out that the "dematerialized" digital world, essential for communicating, working, and consuming, is much more tangible than we would like to believe. Today, it absorbs 10 per cent of the world's electricity and represents nearly 4 per cent of the planet's carbon dioxide emissions. We are struggling to understand these impacts, as they are obscured to us in the mirage of "the cloud".

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At a time of the deployment of 5G, connected cars, and artificial intelligence, The Dark Cloud, the result of an investigation carried out over two years on four continents, reveals the anatomy of a technology that is virtual only in name. Under the guise of limiting the impact of humans on the planet, is already asserting itself as one of the major environmental challenges of the twenty-first century.