Discussion
Which of the following is a renewable source of energy?
Answer: C
Correct answer: Solar power
Solar power is renewable: the resource is replenished continuously on any human timescale, and using it does not diminish what is available tomorrow. Wind, hydro, tidal, geothermal and biomass belong to the same class. Coal and natural gas are fossil fuels, formed over hundreds of millions of years from buried organic matter, so the stock is fixed and burning it releases carbon dioxide that had been locked away. Uranium is the interesting case. Nuclear fission emits almost no carbon dioxide in operation, which makes it a low-carbon source, but the uranium ore itself is a finite mineral deposit, so it is not renewable. Low-carbon and renewable are two different tests, and nuclear passes one and fails the other. India’s renewable capacity has grown rapidly, with solar the fastest-expanding component, and a large share of it in Rajasthan, Gujarat and Karnataka.
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