What is the primary reason fusion is not used in power plants?

Fission generates more energy than fusion.

Fusion causes too much air pollution.

Current technology is unable to control the reaction.

The cost of using fusion in a practical way is too high.

Question

What is the primary reason fusion is not used in power plants?
 
Fission generates more energy than fusion.
 
Fusion causes too much air pollution.
 
Current technology is unable to control the reaction.
 
The cost of using fusion in a practical way is too high.

abhisar · Answer

Currently there is no technology to perform the reaction in a controlled way. `Tokamak` [ https://www.iter.org/mach ] is an ongoing research in this direction.

superhelp101 · Answer

Thanks very very much bæ

abhisar · Answer

What's that in last ?
O_o

superhelp101 · Answer

Last ?

abhisar · Answer

¡ ǝɯoɔןǝʍ ʇsoɯ ǝɹ,noʎ

superhelp101 · Answer

Oh that so cool !!

abhisar · Answer

$\huge \sf \rlap{\color{red}{¡~ǝɯoɔןǝʍ~ʇsoɯ~ǝɹ,noʎ}}{\; ¡~ǝɯoɔןǝʍ~ʇsoɯ~ǝɹ,noʎ}$

superhelp101 · Answer

my computer just randomly shut off, i think it is tired of me :'(