It is not clean if clean is defined as sanitary.
It is clean if considered as environmentally clean, as it produces less harmful effects thatn fossil fuels.
Biomass is considered a renewable resource because of the ability of plant's to regrow. It is actually the number 1 renewable resource used in the world. Although the creation of this energy also causes pollution with-in the atmosphere from the release of the CO2 and Carbon Monoxide.
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not verry clean
Mr Clean.
6 to 8 months
The Clean Air Act
He is squeeky clean and has no record.