2 Answers

Bougui · Answer 1 · 2017-02-28T17:29:32+0000

solar is the cleanest because we do not have to do anything to get to it. but I believe in terms of environmental impact geothermal heat is a great source of heat. I'm not sure what you mean by cleanest but I would say either solar or geothermal energy.

Galzor · Answer 2 · 2017-03-06T13:46:07+0000

i'm not sure if this is the correct answer you are looking for, but i believe that boiling water produces the cleanest heat source.

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