On the question of mitigating the risks farmers face ...
What does "On the question of" mean?
With regard to
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"On the question of mitigating the risks farmers face, most essayists called for greater state intervention."
"On the question of X, ..." is a set formula that is used to introduce a statement related to the question or topic X. Here, greater state intervention is implied to be a way of mitigating the risks (according to "most essayists").