FROM CNN's Jack Cafferty: Here's another very troubling sign about where we are these days: [cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2010/images/06/30/art.one.dollar.jpg caption=""] The United Nations says it's time to scrap the dollar as the main global reserve currency. The U.S. dollar has for years been the currency of choice in troubled times – a safe haven when uncertainty arises. … Continue reading U.N. says scrap dollar as main global reserve currency