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NEW YORK, NY - FEBRUARY 11: The Mayor of London Boris Johnson looks on as he competes with Arianna Huffington in a transatlantic tech challenge at an event hosted by London's Mayor to promote collaboration between New York and the British capital on February 11, 2015 in New York City. (Photo by Craig Barritt/Getty Images for London & Partners)
NEW YORK, NY - FEBRUARY 11: The Mayor of London Boris Johnson looks on as he competes with Arianna Huffington in a transatlantic tech challenge at an event hosted by London's Mayor to promote collaboration between New York and the British capital on February 11, 2015 in New York City. (Photo by Craig Barritt/Getty Images for London & Partners)

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Johnson: If Greece leaves, eurozone will unravel

CNN's Richard Quest speaks to London Mayor Boris Johnson about the ongoing economic challenges faced by Greece and the rest of the eurozone.

Johnson: If Greece leaves, eurozone will unravel

CNN's Richard Quest speaks to London Mayor Boris Johnson about the ongoing economic challenges faced by Greece and the rest of the eurozone.