US imports represent approximately 14% of GDP, exports is about 11%. So net imports represents about 3% of GDP. Assuming emissions are roughly proportional to spending the US is exporting 3% of its emissions.
> Assuming emissions are roughly proportional to spending
But without more info, that seems like a pretty awful assumption. A lot of the stuff we export are services and high value goods that I would think have a relatively low "emissions to value" ratio compared to the lower value manufactured goods we import.
Because it's not an even split. Sure, I could buy that, on average, energy use grows in proportion to economic growth, but some activities (e.g. services) I'd expect to have much less energy use that others (e.g. manufacturing).
But without more info, that seems like a pretty awful assumption. A lot of the stuff we export are services and high value goods that I would think have a relatively low "emissions to value" ratio compared to the lower value manufactured goods we import.