GEOG 1220 Lecture 1: GEOG1220 Lecture 1: Human Impact: Key Concepts and Terms
12 Oct 2015
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Geog 1220 september 14, 2015: speciation: the creation of life; in present day there is more loss than gain of life. Population: 2. 5 million years ago: few people, 1900: 1. 6 billion, 2011: 7 billion, 2015: 7. 3 billion. Human-environment interaction model (see page 480 for more details: population demands resources which changes the environment and/or population, the changes in the environment can result in negative or positive feedback to resources, positive feedback enhances change. 29 deer introduced onto an island (no predators). Because there was not enough food, population went down to 40: negative feedback is like the population of an animal increasing and decreasing. It remains relatively stable: when there are two many deer and wolf, a lot will die due to prey and population will decrease. When there are two few, it allows more time for the animals to reproduce and the population increases. Density: monaco: 19000 km2, singapore 7814 km2, 349 km2, 3. 5km2.
