The lack of rain has especially hit neighboring Somalia, where some regions are battling a famine that has sent thousands fleeing on foot to refugee camps in Kenya and Ethiopia.

CNN: Kenyans unite to raise funds for citizens battling drought

But while rising sea levels, flooding, drought and famine caused by global warming are all likely to contribute to the refugee crisis, the report also warns of the indirect consequences such as the prospect of more widespread conflicts as rival communities battle for control of scarce resources.

CNN: Climate change 'to create 1B refugees'