What if? This is the hypothetical question most of us have asked ourselves at one time or another. In today’s podcast we ask experts in their field for their “What if” Scenario.

In an interdependent, fast-moving world we are increasingly confronted by risks that are complex in nature and global in consequence. From cyber terrorism to a super-volcano, today we hear from those in the know on the greatest perils we face.

The head of Europol, Rob Wainwright, is concerned about the internet; Douglas Rediker, a member of the executive board of the International Monetary Fund, worries about whether global institutions can solve systemic problems; and finally Satoru Nishikawa, a member of the Ministry for Land, Infrastructure, Transport and Tourism in Japan, raises fears about a large-scale volcanic eruption.

Pictured: Mount Etna spews lava on the southern Italian island of Sicily February 9, 2012. Mount Etna is Europe’s tallest and most active volcano. REUTERS/Antonio Parrinello