This is my draft (still very much draft) contribution to an invited review for Animal Production Science, being authored by P. J. Moate, S. R. O. Williams, M. H. Deighton, P. Gregorini, P. Janssen, G. C. Waghorn, J. L. Jacobs, R. J. Eckard, and tentatively titled "A Review: Mitigating Methane Emissions from the dairy industries of Australasia". Final manuscript will be submitted for approval separately. This may undergo several iterations and the emphasis and level of detail included may change. If new data are to be added, a separate release approval will be sought.