summarize the key points of the paper:Abel, G. J. and N. Sander. 2014. "Quantifying Global International Migration Flows." Science 343(6178):1520-22.

The paper by Abel and Sander (2014) titled "Quantifying Global International Migration Flows" presents a comprehensive analysis of international migration patterns. Here are the key points:

**Data Compilation**: The authors compile extensive data on global migration flows using various sources, including national censuses, migration surveys, and administrative records, to quantify international migration more accurately.

**Flow Mapping**: The research emphasizes mapping migration flows between countries, highlighting the complexity and interconnectedness of global migration networks.

**Regional Trends**: Abel and Sander identify significant trends in migration, noting shifts in patterns due to economic, political, and environmental factors. They analyze both historical and contemporary movements, underscoring how migration flows evolve over time.

**Methodological Approach**: The paper discusses the methodological advancements that allow for a better understanding of migration flows, including the use of statistical models to estimate unrecorded migrations and adjustments for inconsistencies in data reporting between countries.

**Policy Implications**: The findings have important implications for policymakers, as understanding migration dynamics can inform immigration policy, resource allocation, and international relations.

**Global Perspective**: The authors advocate for a global perspective on migration, arguing that local and national policies must consider global interdependencies and trends.

Overall, the paper aims to provide a clearer picture of international migration flows, contributing to the academic discourse and offering practical insights for addressing migration's challenges and opportunities.