A new study suggests that, in the case of global catastrophe, urban agriculture alone could sustain only about one fifth of the population of a temperate, median-sized city, but the whole city could be fed by also farming land within a short distance of the urban area.
Not to “uhm, acktshually”, but technically New York is temperate (according to Koppen, temperate subtropical, which leads me to question his wisdom), and it snows quite a bit there.
But I see your point. There are plenty of people living in less favorable climates agriculture-wise.
The city in question is in new zealand. While new york may be temperate (though it doesn’t show up in the maps I see - might be looking at maps on my phone) that doesn’t mean it is really comparible.