Snapshot: The biggest problems facing the world

In 2010, Cambridge professor Nicholas Boyle said "a great event" in the year 2014 would be pivotal in determining whether the 21st Century would bring peace and prosperity or war and poverty.

With the loss of two Malaysia Airlines flights, the kidnapping of 200 schoolgirls in Nigeria, war in Gaza and Israel, the birth of an "Islamic State" in the Middle East, tensions in Europe over Ukraine and the Ebola outbreak in West Africa, his prediction doesn't seem that far off.

BBC News takes a look at some of the crises facing world leaders, as Nato members gather in the Welsh city of Newport for a summit.

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