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From Baby Boom to Baby Bust
For most of the 20th century, population debates focused on rapid growth, “overpopulation” and pressure on resources. Today, the story is shifting. Global total fertility has more than halved since around 1950, falling from about 5 children per woman to roughly 2.2 in 2021. According to recent UN and Lancet‑linked analyses, over half of all countries already have fertility below the “replacement” level of about 2.1 children per woman needed to keep populations stable without immigration.
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As countries become richer and improve living conditions, they move from a pattern dominated by infectious diseases and high mortality to one dominated by chronic (degenerative) diseases and lower mortality. This shift is closely linked to changes in demography (falling death rates, then falling birth rates), urbanisation, and improvements in health care, nutrition and hygiene.
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Geographers measure population change by looking at how many people are born, how many die, and how many move in or out of a place. In other words, population change is driven by three main components: fertility, mortality and migration.​
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For much of recent history, people have equated population change with population growth. Over the last two centuries, global population has risen dramatically, with especially rapid growth between the 1950s and the late 20th century. However, this is only part of the story: some regions still grow quickly, others are close to zero growth, and several countries now face population decline.
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Critical thinking in geography means slowing down, asking sharp questions about places and patterns, and using evidence and logic (not just opinions) to reach a better conclusion.
Geography is more than maps and place names; it is about the “whys of where” – why things are located where they are, and how places are connected. Critical thinking in geography means making sense of spatial patterns, questioning sources, and linking local places to global processes.
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