With so many uncertainties, the Greek economy cannot hope to attract the investment it needs to spur recovery.

ECONOMIST: Greece and the euro

Investors around the globe are on the edge of their seats and the U.S. stock market is emotional, especially now, with so many uncertainties up in the air.

FORBES: Worried About Investing In 2013? Buy American and Prosper

With so many uncertainties still to be resolved, investment in the UK nuclear sector was still a "leap of faith", said George Borovas, head of nuclear projects at global law firm Pillsbury.

BBC: Hitachi buys UK nuclear project from E.On and RWE