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Take a look at these further reading suggestions to deepen your understanding:
- Chapter 4 on Geothermal Energy (pages 71–78) in the special report of the Intergovernmental Panel on Climate Change on Renewable Energy Sources and Climate Change Mitigation
- A report on The Future of Geothermal Energy by the MIT Energy Initiative, published in November 2006
- Slides from a presentation on ‘Heat pumps and their role in the decarbonising of heat’ by Professor Chris Underwood, given at the CIBSE North-east region technical meeting in January 2018
- Global solar heating and cooling statistics from the Solar Heat Worldwide report