I see you have no category for economy this is the most import thing at this time of events of a world recession. I am now visualizing a federal world government but unlike EU or USA local governments in its states or countries. To my mind this would be the best system as EU shows a problem with a union based currency.
But let look at the world as we see it today, because of property devaluation it means that money seen on paper as mortgage value has shrunk. Property of course was supporting loans when banks called in the loans it caused bankruptcy and lack of money to be loaned out, many banks went out of business. its of course more complexer.
The problem is that there is not enough money circulating the global system. Governments are mostly in debt and employment has rose due to company down sizing.
The quick and easy way is not for governments to auction bonds that know one wishes to buy. But to get money quickly back into the global economy. Now by allowing governments to print enough money to pay off their debts and freezing currency rates whilst this process is underway. Keeping the value of each currencies unit at the rate when frozen. Will pump enough money to boost the world economy. this would need to be done in unison and monitored carefully and be a one of solution in this next decade. But in truth only a world government could achieve this or maybe United Nations?