This West/rest dichotomy seems a bit outdated. Is China the West? oil-rich Middle East? Both of those have high emissions per capita - in the case of the Middle East, some of the highest in the world.
Well then, here's another reason it's false: there is huge variation within the West, with the US for example having more than twice as much co2 emissions per capita as the UK.
Mostly I meant developed vs undeveloped. Those are Eastern countries who are still developing. I think the dichotomy fits just fine still.