Mainiac, Consumption Emissions (I think it's a better term) did not flatline. According to the graph I posted for example, it rose in the UK from 650 Mt to 760 Mt from 1992 to 2004. It could be that they would have gone down in a world without trade, but I'm not sure how you're going to back that claim.
I know perfectly well that saying "West" ain't very helpful, but at some points we need to talk in terms of generalities. "Developed countries" would have been a better, if more cumbersome term. However, I think my point still stand.
Also, fun fact, between 2005 and 2008, the US reduced its per capita CO2 emissions from 19.7 to 18.6 tons of CO2 equivalent (-5.6%), according to that World Bank database I linked. The UK in the meantime reduced its emissions from 9 to 8.5 (again, -5.6%). So much for the Bush presidency.
Finally, I don't think there is mission creeps. I said "CO2 emissions only goes down when growth goes down, as in the 2008 crisis". You and others replied "No, some countries managed to grow AND reduce emissions", to which I object "Those countries actually only reduced emissions through shifting their polluting industry to developing countries". A nice counter argument would be a country that achieved significant CE reductions while growing significantly.
Don't mistake me, efficiency gains are a thing. We are becoming more and more efficient, in terms of $ of GDP per unit CO2. I just claim that those efficiency gains aren't enough to reduce CO2 emissions while maintaining significant growth.