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AbstractThe rise in global displacement has inspired a wave of quantitative comparative research in recent years. While deeper systematic knowledge on contextual determinants of disaster‐related mobility and associated risks is in high demand, quantitative modelling of human displacement should be exercised with care. In this commentary, I reflect on three central challenges related to the quality of available displacement statistics. Future scientific progress in this field would benefit tremendously from harmonization and validation of displacement data that separate between distinct mobility responses.

Abstract
Is climate change a major security threat? How has research on climate and conflict progressed in recent years? And where should it move forward? This brief essay reflects on some ways in which climatic changes could constitute a threat to peace and stability. Rather than assuming a direct causal link, the essay argues that climate change may exert an indirect and conditional effect on conflict risk, increasing the security gap between affluent societies well able to cope with climate change and societies already suffering from violence and instability, who are unlikely to achieve successful adaptation on their own. For this reason, peace building is quite possibly the most effective climate resilience policy in unstable corners of the world.

Kenneth Boulding's (1962) notion of a loss-of-strength gradient (LSG) has been successfully applied to explain the military reach of states. The capability of a country (a.k.a. its national strength) is largest at its home base and declines as the nation moves away. Capable states are relatively less impeded by distance and can therefore influence more distant regions. Given armed conflict, battles are expected to occur in areas where the projected powers of the antagonists are comparable. When the aggressor's projected power is greater than the national strength of the defender, the latter side should give in without violence. This paper is a first attempt to apply Boulding's theory of international power projection to the study of civil war. Using new data on the point location of conflict onset and a variety of measures of state and rebel strength, this paper tests empirically one corollary of the LSG model: that civil wars in general locate further away from the capital in more powerful regimes.

When all else fails, aggrieved groups of society often resort to violence to redress their grievance - either by seeking to overthrow the ruling government or by attempting to secede. The strength of the rebel group relative to the state determines what direction the conflict will take. In institutionally and economically capable countries, any opposition group is likely to be inferior to the government. These groups will see secession as the most viable strategy to improve living conditions. Inconsistent, poor, and resource-dependent regimes are typically quite unstable and should therefore be more likely to attract coups and revolutions. In addition, large and ethnically diverse countries contain a higher number of peripheral and possibly marginalized groups, as well as remote and inaccessible terrain, both of which are expected to favor secessionist insurgency. Smaller countries, in contrast, offer few opportunities for separatist claims but, in such countries, capturing the state might also be a more realistic objective. This article provides a first test of these presumptions by estimating the effect of several popular explanatory factors separately on the risk of territorial and governmental conflict, 1946-99. The analysis offers considerable support and demonstrates that territorial and governmental conflicts are shaped, in large part, by different causal mechanisms. The reputed parabolic relationship between democracy and risk of civil war only pertains to state-centered conflicts, whereas democracy has a positive and near-linear effect on the risk of territorial rebellion. Moreover, the analysis strongly suggests that the puzzling no-finding of ethnicity in several prominent studies is affected by their inability to account for rebel objective in civil war.