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A gallery assistant adjusts the minute hand of the Royal Observatory clock in Greenwich. In 1968, Daylight Saving Time was adopted on an experimental basis in Britain and Ireland. Photograph: Johnny Green/PA

(...) was first adopted in Germany during the first World War to save electricity. In the UK, the Summer(...)

In 1992, wind power was a very expensive technology but this did not stop some advocates suggesting an immediate large-scale adoption in Ireland. File photograph: Nick Ansell/PA Wire

(...), the ESB held a conference on using wind power to generate electricity. At the time wind power was a(...)