Independent (UK): The digital photos, shared videos, tweets and Facebook chatter that make up our online lives may appear to have no physical form, but they contribute to some very real environmental damage, the campaign group Greenpeace warns. The vast amount of digital data that we upload and access via social networks and on websites such as YouTube is stored in what the internet industry calls the “cloud”, by which it means a vast numbers of computers owned by the likes of Google, Yahoo and …