headline: How streaming videos gives a Danish city hot water
text: Datacentres are one of the backbones of the internet, housing the servers used to upload selfies, stream videos or chat online.
  uge amounts of heat generated by the servers is often wasted, but one facility in Denmark is providing hot water and warmth to people’s homes.
  Adrienne Murray reports for BBC Click.
  See more at Click's website and @BBCClick.