> don't consume as much non-local food
http://www.realclearscience.com/blog/2015/06/the_biggest_myt...
> don't consume as much non-local food
http://www.realclearscience.com/blog/2015/06/the_biggest_myt...
What the article is asserting and what the science shows is that even if you have Avacados being grown literally next door the environmental impact of buying them locally is often higher than shipping them from abroad.
For example, the SGU podcast they link to [1] (around 55m:50s in) discusses that the net environmental impact (carbon emissions) of shipping beef to the UK from New Zealand is less than consuming UK beef in the UK. So if you're an environmentally conscious UK consumer you should be spending extra to buy NZ beef instead of buying locally produced beef.
This is because the carbon impact of the transportation generally hovers around 10%, which leaves the other 90% for actually producing the product "locally", and some locations on earth are vastly more efficient by every environmental metric in growing certain crops or raising certain livestock.
From the podcast: "An acre of land in Idaho can produce twice the amount of potatoes as an acre of land in Kansas".
Which leaves two reasons to buy locally.
Firstly you may be living in one of the places that's efficient at producing a given product, e.g. you'd buy local beef in New Zealand instead of importing it from the UK.
Secondly there are certain products that don't ship well, e.g. heirloom tomatoes. There you simply don't have the option of buying anything except local varieties.
“environmental impact” and “carbon emissions” are not the same thing; the latter is a very limited subset of the former.
I put "carbon emissions" in parentheses there because the reason for this "buy local" fallacy to begin with is because people intuitively assume that it's the transportation of the good that makes all the difference, when the reality is that that's just 1/10 of the cost.
The environmental impact of the transportation is almost exclusively carbon emissions.
No, most of the environmental impacts of agricultural productions besides carbon emissions are still externalities, usually time-shifted, that aren't priced into the product.