Seriously, Emma's right that transport is just one piece. Even local grass-fed beef needs huge amounts of land and water, and the feed grown for it often gets shipped in anyway. So you're really just shifting a tiny bit of the pollution from the truck to the tractor in the fields.
My beef comes from a ranch 50 miles away instead of a factory farm 1500 miles off. The methane's still bad, but cutting out that transport haul matters.
Honestly, how much difference does it really make? The cow is still eating and, you know, making methane no matter where it lives. The transport part is a tiny slice of the whole problem. Feels like focusing on local vs. not is missing the bigger, messier picture of just how much meat costs the planet.