It isn't what happens at the moment. Every dollar of growth worldwide is subtracted many times over from our environmental commons. At the moment the global economy is a heavily negative-sum game.
You don't need to have read The Wealth of Nations to know that it's possible to increase the GDP of a country without decreasing the overall savings. Service driven economies are the best example of this.
Please show your evidence that global trade is a zero sum game and that the "imperial core" has reaped all the benefits. Not one example of a singular country (sure, there are some losers for a variety of reasons), but for example, show us how the African continent has gotten worse due to globalization.
I didn't say it was zero sum. Poorer nations have experienced some growth, and a lot of that growth has been extracted by the West. Generally, the more a developing country has embraced globalization, the worse it has been exploited. This is not a hugely controversial statement.
If you'd really like to understand the power dynamics, you'll need to do some reading. Former World Bank chief economist Joseph Stiglitz's "Globalization and its Discontents" is a good start, though a little dated now.
See you on the picket lines, comrade!