Is China storing problems for the future?

As America struggles to control its debt, no country is watching more closely than China.

The Chinese are major investors in the American economy and the single largest holder of US Treasury debt, and today, the US Vice President Joe Biden, who's visiting the country, said the Chinese had 'nothing to worry about'.

But there are fears China may not be immune, if the US tips back into recession, as Damian Grammaticas reports.