By Tommy Lee Walker / Shutterstock Every time we make a call on Zoom, upload a document to the cloud or stream a video, our computers connect to vast warehouses filled with servers to store or access data. Every time we make a call on Zoom, upload a document to the cloud or stream a video, our computers connect to vast warehouses filled with servers to store or access data. Not so long ago, European countries were falling over each other to welcome the firms that run these warehouses, known as data centres or bit barns. Wide-eyed politicians trumpeted investments and dreamt of creating global …