I can't believe there where more then 200 million people globally unemployeed in 2012
That's terrible! I hope things are improving. More jobs need to be created and corporations encouraged to act more responsibly!
I'm not sure, but the cause for unemployment are heavily debated. 
Automation, outsourcing of jobs, too many people for too few jobs. Those are just a few things I can think of off the top of my head.
One reason is technological unemployment which is the loss of jobs cause by technological change