It's not only Trump's tantrums that could defeat the purpose of G20 summit

The G-20 was established in 1999 as a forum for finance chiefs and central bankers from economies representing some two-thirds of the world's population and 85% of global output

The world’s principal forum of global leaders risks marking its 10th anniversary with an identity crisis.

The debut Group of 20 leaders’ summit was convened in 2008 to develop an international response to the financial crisis ripping through markets. Leaders attending the latest edition in Buenos Aires on Friday and Saturday face shared threats from trade disputes to migration and climate change—but are so lacking in common purpose that a blowup looks more likely than a collective response.

President Donald Trump’s “America First” agenda is one obvious culprit for the breakdown in global solidarity, but far from the only one. Even as