There has been a surge in international migration in recent years, reaching a total of 244 million individuals in 2015. Forced displacement has also reached a record high, with 65.3 million individuals displaced worldwide by the end of 2015 – including refugees, IDPs and asylum seekers. Yet while the absolute numbers have increased over the last 15 years, migrants as a percentage of total global population has remained stable at about three percent. A majority of migrants remain on their own continents – nearly nine out of ten African migrants settle on the African continent, while eight out of ten Asian migrants remain in Asia. Forced displacement is predominantly an issue outside wealthy economies:
nine out of ten refugees are hosted by low and middle-income countries.

Cities are on the sharp end of a range of risks from criminal violence, terrorism and war to demographic pressures, to climate and environmental change. Coastal megacities are especially at risk given the specific impacts of climate change they face, including accelerated global sea-level rise, increased storm frequency and severity, and destruction to critical infrastructure such as port facilities, rail and road linkages, and energy installations, all of which are amplified as urban populations become ever larger.

[This article originally appeared on New Security Beat, the blog of The Wilson Center's Environment Change and Security Program]