Global risks are today's risks. They are an integral part of a world characterised by ever greater complexity and accelerating change, and they are becoming more relevant and pervasive than ever.
Businesses cope well with those kinds of "familiar" business risks traditionally within the canvas of the firm (eg, project risks, competitive risks, industry risks, currency risks), but often find themselves far less well equipped to deal with a set of new, less familiar, potentially more dangerous, global risks.