Question

Which of the following elements produces no harmful emissions when used as an energy source?

Answer 1

There are many non renewable ways of producing energy. Hydropower  uses kinetic energy of the moving or falling water is used to generate clean electricity with the help of turbines connected to generators. Solar energy uses solar panels to use the energy of the sun to produce energy. In both the cases, no harmful emissions are produce.

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Answer 2

Wind produce no harmful emissions, since harnessing energy derived from  wind motion is one of the many 'cleaner sources of energy'. All the other choices would produce a negative impact in the environment because of their carbon emissions.  

EXPLANATION:

Harnessing energy from wind is a sustainable and clean ways to produce electricity, as wind energy does not discharge 'toxic pollution' or 'global' 'warming emissions'. Wind is also affordable, inexhaustible, and abundant making it a large-scale and a viable substitute to fossil fuels.

Wind turbines do not discharge emissions which can pollute the water/air and they do not need water for cooling. Wind turbines reduce the amount of 'electricity production' from fossil fuels, resulting in lower overall carbon dioxide emissions and air pollution.