A key message of the 2021 World Climate Summit was that the use of coal must be phased out for the good of the planet. Content removed due to copyright restrictions. Instead, a mixture of renewable energies will be required to achieve zero-carbon Sources: The Sunday Times, 17 October 2021 The Times, 26 October and 24 November 2021 nsenergybusiness.com, 4 November 2021 Define economic sustainability and give one example from the information of a change that can be used to illustrate it.

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