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Can any source of energy be pollution-free?

Why or why not?
 
can be completely pollution-free.
 
But
are considered to be pollution-free. But their 
may cause
.
 
In the case of
, the waste produced after 
is zero. But the wastes that are produced during 
are hazardous.
Answer variants:
fusion
wind energy
no source of energy
some sources of energy
No
fission
solar cells
environmental damage
nuclear energy
manufacturing