Significant issues relating to most of the Earth citizens.
Transnational or transboundary.
Affects large number of people.
Persists and is long lasting.
Is underlying cause of other events.
Global Warming, for example, effects most of the earth’s
citizens, persistent and long lasting that may takes years to
resolved. It is also transnational and its effect can be felt
across the countries which responsible for creating it. It is
also an underlying cause of other issues—desertification.