Juan, a number of worthwhile points, but I don't think population increase in the Arab countries is due to climate change. Starting about 150 years ago the effects of European imperialism were being felt and one of those effects was modern water management. The largest department in Cromer's Egypt, for example, consisted of hydrologists and civil engineers. Improvements in irrigation of the Nile Valley allowed for significant population growth, but without a commensurate growth in economic infrastructure. A century later the population is much larger, but still very poor.
Juan, a number of worthwhile points, but I don't think population increase in the Arab countries is due to climate change. Starting about 150 years ago the effects of European imperialism were being felt and one of those effects was modern water management. The largest department in Cromer's Egypt, for example, consisted of hydrologists and civil engineers. Improvements in irrigation of the Nile Valley allowed for significant population growth, but without a commensurate growth in economic infrastructure. A century later the population is much larger, but still very poor.