A system based on debt 
Discussion
And this charts tells only the story about government debt. A country might appear to have a healthy amount of debt (which this charts seem to suggest about the green countries), but the truth is that many times the debt is just outsourced to corporations and citizens themselves in the form of mortgages and other types of credit.
United States debt
Government debt: $31.4 trillion
Household debt: $17.1 trillion
Mortgage debt: $12 trillion
Auto loans: $1.6 trillion
Credit card debt: $986 billion