Think Greece's economy is the one in trouble? It's CHINA that's facing financial meltdown and the biggest stock market crash since the Great Depression
Nearly $3trillion wiped off Chinese stock markets in just the last few weeks
Government and investors launched campaign to prop up tumbling shares
Booming stock markets had more than doubled in the year to mid-June
Experts draw parallels with the credit booms that led up to the 1929 crash
Analyst: 'I've never seen this kind of slump before. Don't think anyone has'