The official G20 G20 The Group of Twenty, or G20, is a forum for international cooperation on the most important aspects of the international economic and financial agenda. It brings together 19 countries and the European Union, which together represent around 90% of global GDP, 80% of global trade and two thirds of the world’s population. engagement groups for Civil Society (Civil20) and Trade Unions (Labour20) has called upon G20 G20 The Group of Twenty, or G20, is a forum for international cooperation on the most important aspects of the international economic and financial agenda. It brings together 19 countries and the European Union, which together represent around 90% of global GDP, 80% of global trade and two thirds of the world’s population. leaders to take action to protect whistleblowers from retaliation.