Hmm, I haven't chased that detail down myselg (busy ATM), but I strongly suspect the area intended was that of mainland Australia (or, close to equivilantly, th

Hmm, I haven't chased that detail down myselg (busy ATM), but I strongly suspect the area intended was that of mainland Australia (or, close to equivilantly, the area of mainland lower 48 contiguous USofA). Certainly a detail worth checking, farmland in Australia is much less than the area of Australia.