It is timely that Engineering should devote a special issue to the topic of clean energy.The authors of the research articles and the views and comments cover much of what is a very diverse and controversial field.Responses to this topic cover a spectrum ranging from those that argue for emergency action to prevent the extinction of the human race to those that deny the existence of climate change.Before dismissing any group,it is informative for engineers and technologists to note that there is a fairly even distribution across this spectrum[1]as shown in Fig.1.
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