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Θέλω να υπενθυμίσω αυτά που είπε ο sir norman foster στη Φλωρεντία.
we know — and it is no laughing matter, mr seligman, you who always pour scorn on these ideas — that solar energy has an efficiency of almost 100% for the purposes of heating buildings; of around 70% for heating water; and of up to 45% for air conditioning.