There's a lot of GHG emissions associated with how far we travel -- also what modes we choose and how fast we go, of course.
There's also a lot of transportation-related GHG emissions wrapped up in everything that we purchase.
Take a look at this article, "Living Closer to Home," on the Sierra Club website:
A public awareness campaign about the GHG emissions and other costs of going farther than we have to go -- and buying products from unnecessarily far-off places -- would have positive benefits.
The purchasing part could be presented as "buy local" and most people would see it as an economic development campaign instead of climate protection -- and that's not bad.