Answer:
The correct answers to the question posted here, would be thus:
1. Geothermal energy: Might vent toxic underground gasses. Although geothermal sources of energy are considered in general beneficial, and have a lot of pros, there are some cons to it. One of them is that through it gases can be released from the eart to the surface and the other is that extraction of these types of energy may cause natural situations like earthquakes.
2. Solar energy: May not be captured at night in most regions. Since this source depends entirely on the solar emitions towards Earth, and the power of solar rays, at night, this power source would be lost, especially in places where emitions at night are really low.
3. Biomass: Releases CO2 into the atmosphere. This source of energy has been debted for a long time, particularly because science has tried to garner the power of this source of energy in order to use available resources with minimum damage to the environment. However, the process of degradation of biomass generates large amounts of CO2, which in itself would deny the purpose of seeking cleaner sources of energy.
