It must be proves that John was insane at the time of the murder, otherwise, by the M’Naghten rules, he cannot claim insanity as a reason of murder.
Solar energy plants take up a lot of land space and can destroy animals habitats. Geothermal is bad because it gives of CO2 which can lead to global warming. Finally, wind power plants (turbines) also take up a lot of space and can destroy animals habitats. They can even be put in the water and destroy marine life.
