Mercury in the environment?

What are two ways to reduce the amount of mercury released into the environment when burning fossil fuels?

Coal combustion is the largest source of mercury (Hg) emissions worldwide.

Hg emissions can be reduced by burning a fossil fuel other than coal (oil or gas).

Hg emissions can be reduced by burning a coal with below-average Hg content.

Hg release to the environment can be reduced by effective capture of fly ash and disposal in such a way to reduce leaching of Hg from the fly ash.
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