what are the disadvantages to geothermal energy?
['Geothermal energy has high initial capital costs. ... ', 'May release harmful gases. ... ', 'Suited to a particular region. ... ', 'Geothermal heat pumps have to be powered. ... ', 'Geothermal sites may experience a dry spell. ... ', 'Sustainability issues. ... ', 'Can cause surface instability. ... ', 'Extremely high temperatures required.']