The greenback is in serious trouble with warnings that the US dollar will continue to slip following the G20 summit. It's not just the weakness of the US economy that's hurting the dollar. It's the signs of recovery in other parts of the world and the dollar is now being used to buy riskier assets. Any so-called sign of recovery in the US market is because the US Government is borrowing massively, creating a massive deficit, to pump money into the economy. In the long term, that's unsustainable which will keep putting pressure on the dollar.

That's why we now have the World Bank warning that that the dollar could lose it's status as the world's key reserve currency. World Bank President Robert Zoellick says there will increasingly be other options.

So what are these options? I don't believe the US dollar will fade away because the US economy is still the biggest and most powerful in the world, whatever it's problems might be. But the premier currency in Asia will have a leading reserve function to sit along side the US dollar and Euro by 2030. The Chinese yuan could start gaining power.