Seems to me, the two will still be correlated however. E.g. if the entire world buys their bananas from one place, because the price is the cheapeast or whateve

Seems to me, the two will still be correlated however. E.g. if the entire world buys their bananas from one place, because the price is the cheapeast or whatever, then this will require a massive concentration of agriculture in that location impacts for the local environment - and those local impacts can have global effects, e.g. in case of large-scale deforestation. I don't have data, but it seems to me, local agriculture avoids those problems, simply because it introduces more variablility and spreads the environmental burden over a larger area.