Yes, Geothermal energy is a renewable source.
Geothermal energy is a renewable source because its source is generated unlimited amount of heat by the earth core. It is a sustainable energy source. It is also a non-renewable source because it can be re-used multiple times again and again and looses its ability to create energy.
It is the excellent energy for the meetings, because it opposes to other renewable sources such as wind and solar energy. Great for heating and cooling and used in even small households can benefit. Geothermal energy has been used for thousand of years in some countries like turkey, unites states, new zealand and japan for heating and cooling. It cost less fluctuation and stable electricity prizes.
Yes, its consequences is very bad to communities or surrounding environments because it involves no combustion. So, the level of air pollutants they emit are low. It emits 97% low acid rain which causing sulfur compounds and 82% of green house gases.