The correct options are
A Refugee Crisis
B Submerging of island nations.
C Melting of Glaciers
The heating of the Earth because of increased greenhouse effect is called global warming. The rise in temperature can cause melting of the glaciers in the coldest parts of the world. This can lead to sea level rise and floods in coastal areas. Small islands such Kiribati, Tuvalu, and the Maldives are at risk as they may get submerged in the oceans. This can further lead to a refugee crisis. The UN estimated that by 2050, there will be more than 150 million environmental refugees. Apart from these, drastic changes in the climate may lead to extinction of several plant and animal species.