Migration is a constant in human history. Environmental change affects migration, and in turn, migration provides ways to escape ecological risks. We employ historical data on migration flows and various types of climatic indicators to examine the causal relationship between climatic drivers and migration response. We study migration responses that occur between different countries of the world or between other areas of the same country. Given that climatic stress may induce indirect effects that propagate to areas not initially hit by the climatic event, we employ econometric models to identify climate-fragility connections via migration. We study the implications through migration of climate change to both origin and destination countries.