This free course was written by Allan Cochrane.
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The material acknowledged below is Proprietary and used under licence (not subject to Creative Commons Licence). Grateful acknowledgement is made to the following sources for permission to reproduce material in this free course:
Figure 1: David Novi/123rf
Figure 2: dynasoar/Getty Images
Figure 3a: Peter Reimann https://www.gazettelive.co.uk/ news/ teesside-news/ teesdale-wilderness-park-set-facelift-7654000
Figure 3b: Mike Kipling Photography/Alamy Stock Photo
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