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--- courses:ast100:7.1 [2026/03/23 07:39] – [1. Population growth] asad
+++ courses:ast100:7.1 [2026/03/23 08:00] (current) – [2. Out of Africa] asad
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 Finally, the graph reaches a plateau labeled as **global warming risk**, suggesting a period of critical transition and potential stabilization. As the population approaches the year 2100, the mathematical model indicates a slowing of growth as humanity confronts the environmental limits of the planet. This modern era, characterized by hyper-connectivity and immense industrial output, has brought us to a point where our collective actions determine the stability of the global climate. The long history shown on this plot culminates in a moment of profound responsibility, where the survival of the curve depends on sustainable management.
 ===== - Out of Africa =====
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+We will now focus on the Out of Africa migration in close detail, as this event represents the definitive chapter in human history that led to the global distribution of our species. Understanding this migration is essential because it explains the genetic diversity of modern populations and the remarkable adaptability of Homo sapiens to various climates and terrains. This movement was not a single event but a series of complex pulses that eventually allowed humans to inhabit every corner of the Earth. By tracing these paths, we gain insight into the technological and cognitive developments that enabled early humans to overcome geographical barriers and establish the interconnected global society we see today.
+The migration began within Africa roughly 200,000 years ago, followed by a major dispersal between 70,000 and 50,000 years ago into the Middle East. From this juncture, a primary southern branch moved along the coast of Asia, where the Bengal Basin and modern-day Bangladesh served as a critical geographic bottleneck. As a fertile delta between the Indian subcontinent and Southeast Asia, this area provided the riverine resources necessary for early humans to thrive before pushing toward the Solomon Islands and Australia by 50,000 years ago. This rapid coastal expansion highlights an early mastery of maritime environments and the ability to sustain growth while traversing the vast Indian Ocean rim.
+Simultaneously, other groups moved northward, reaching Europe and East Asia between 45,000 and 35,000 years ago. These populations adapted to diverse ecosystems, from temperate forests to cold northern tundras, requiring significant cultural and technological innovations. By roughly 20,000 to 15,000 years ago, humans crossed the Bering Land Bridge into North America, eventually populating the entire continent and reaching the southern tip of South America by 12,000 years ago. This leg of the migration represents an incredible feat of endurance, as humans tracked megafauna across frozen landscapes and through varied climates to settle the Americas. This process established the first truly global presence of our species across all major landmasses.
+The final phase of human expansion occurred much later with the colonization of remote Pacific Islands, beginning roughly 3,500 years ago from Taiwan and the Philippines. Skilled navigators reached New Guinea and the Solomon Islands before pushing into the deep Pacific, settling Fiji and Polynesia by 2,500 years ago. These migrations utilized advanced navigational techniques, such as celestial observation and current tracking, to locate isolated landmasses across thousands of miles of open ocean. By the conclusion of these journeys, humans had successfully inhabited nearly every habitable region on the planet. This million-year saga from African origins to global dominance fundamentally reshaped the Earth's ecological and cultural landscape, creating the unified human history we study today.