What I find fascinating about the wingnuts stoking fears about a one world currency is how it's a classic example of how the rich and powerful that conservatism exists for are exploiting the paranoid but often powerless. Having read Naomi Klein's book The Shock Doctrine, I'm aware of how currency trading is used a) as another fancy way for rich people to make more money and b) to punish errant countries for perceived slights against capitalism and white supremacy. I'm sure there's many reasons to oppose it, some good and some bad, but it's incredibly relevant that the currency market is used by the powerful to control the not-powerful.