The Tropic of Capricorn (or the Southern Tropic) is the circle of latitude that contains the subsolar point on the December (or southern) solstice. It is thus the southernmost latitude where the Sun can be directly overhead. Its northern equivalent is the Tropic of Cancer.
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Solar is inconsistent due to time of day and/or weather.
Nuclear creates long lasting radioactive waste.
Hydroelectric construction of this resource destroys river ecosystems.
Coal creates pollution when burned.
Wind is inconsistent due to only to weather.
Until the early Proterozic there were only negligible amounts of free oxygen in the atmosphere
