How did a forum for global cooperation become a stage for authoritarians? The Guardian world affairs editor, Julian Borger, analyses the G20 ahead of the summit in Buenos Aires with the help of the Guardian’s foreign correspondents. Plus William Davies on why we stopped trusting elites. To support The Guardian’s independent journalism, visit <a href="https://www.theguardian.com/todayinfocus/support">theguardian.com/todayinfocus/support</a>