They want another currency to invest in, because they won't invest in the dollar anymore. Why don't they want to invest in the dollar? Well, maybe because it is quickly becoming worthless. Since the government has decided that printing money is a good way of generating revenue (something a 5 year old knows doesn't work, but apparently our government doesn't know that), China wants to invest in something real.
I have no love for China, but this is TERRIBLE news! This could be the beginning of an economic isolation for the United States.
Thank you so much dear communist leaders of America!