The G20 has the following on its webpage: (actually the wiki page for G20 because the footnote to the text has gone missing. (https://www.g20.org/about_faq.aspx#5_What_are_the_criteria_for_G-20_membership)
Purpose: Bring together systemically important industrialized and developing economies to discuss key issues in the global economy.
The language. “global economy” looks innocent but read closely it suggest that there is a global economy that is different from the global society (just a part of it) and different from the global intersection between humans and nature. These are, as the leaderships tend to want it, pushed to the side. The economy can improve but we don’t have to consider those marginalized and other “externalities,” except to the extent their inclusion supports growth and stability. In particular issues that question growth are avoided and the use of green to accelerate growth is not questioned.
Language is powerful and we need to learn how to read it. The justification, not spoken, is that the world needs to be governed, however uncomfortable. That means holding elites together and in place and subordinating the economy to that purpose.