Answer:
Water level increase, animals that live on ice caps adapt or die, food chain thrown off etc.
As far as a threat, North Korea has been seen as such for many years (since WWII), when North Korea sided with Russia. America and its Capitalism were not fond of the Communist party, and so we have really been fighting/being concerned about Russian influence.
Historically North and South Korea have been in conflict many years before America and Russia got involved. When we did though it got worse.
Trump has done very little to resolve this, some would say he is making it worse.
AND as for any current events ask Google!
Geographers use the regional unit to map features of particular interest, and data can be compared between regions to help understand trends, identify patterns, or assist in explaining a particular phenomenon. Regions are traditionally defined by internal characteristics that provide a sense of place.