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\subsection{Higgs physics at Higher higher  Energy} The possibility of further increasing the centre-of-mass energy of the ILC by another factor of two to $\sqrt{s}=$ 1 TeV has also been considered. The other linear collider project, CLIC~\cite{cite:CLICDR}, could provide a higher-energy physics programme all the way to $\sqrt{s}=$ 3 TeV. It would require, however, considerably more electrical power, estimated at $\sim 600$~MW.