In 2017, a severe and prolonged drought had hit countries in Africa and the Middle East, bringing crop shortage, livestock death, water scarcity and disease. Food shortages escalated into near-famine conditions in countries with low resilience against shocks, such as Nigeria, Somalia, South Sudan and Yemen. In such a context, rapid quantitative data is required to respond to urgent developmental needs of the affected populations. Therefore, we designed and implemented the Rapid Emergency Response Survey (RERS).
Around 250 million migrants currently live outside their countries of birth, making up approximately 3.5 percent of the world population. Despite the widespread perception of a global migration crisis, this ratio has stayed remarkably stable since the end of the Second World War and lags well behind other major metrics of globalization – international trade, capital flows, tourism etc. A more remarkable statistic is that refugees, at around 15 million, account for 6 percent of the migrant population and only 0.2 percent of world population. In other words, we can fit all refugees in the world in a city with an area of 5000 square kilometers – roughly the size of metropolitan Istanbul or London or Paris – and still have some space left over.