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Published online by Cambridge University Press: 26 May 2016
Improved Sunyaev-Zel'dovich effect data from interferometers and single dishes, and new X-ray data from Chandra and XMM, are allowing a more detailed examination of the Sunyaev-Zel'dovich effect/X-ray technique for the measurement of distance, and hence the Hubble constant. This article reviews progress so far and the current results for H0, and discusses the potential of surveys for the Sunyaev-Zel'dovich effect as tests for cosmological parameters and cluster evolution.