Such as?

More to the point, and putting ecocide and genocide in a similar ballpark, doesn’t anyone remember Rwanda anymore? Or Srebrenica? (this latter labeled technically as a massacre). Does anyone believe that those atrocities could have been stopped by “harsh words” alone? Or by economic sanctions? They weren’t.

Enforcement in this case means imposition of force, which in an inter-state situation means invasion or, at the very least, a military attack (see Kosovo in ‘99, technically not an invasion).

I didn't count UN sanctioned peacekeeping as "invasion", but I can see how this could be seen as a purely semantic distinction.

I personally think it should be one instrument on the table as a matter of last resort, mainly for the purpose of deterrence.