G20: A helpful guide to saving the world Opinion: Here's what to look for as the rich and powerful meet in London. By Michael Moran - GlobalPost Columnist NEW YORK — As the leaders of the Group of 20 major industrial nations gather for their much anticipated summit April 2 in London, President Barack Obama and his senior economic aides have taken great pains to prepare the ground for unity. Gone is the carping about the fact that Franc...