ES2lecture5 - Lecture5 HumanPopulations :...

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Lecture 5 Human Populations From last lecture – five people born per every 2 people that die Underlying phenomenon: birth rates are higher than death rates Stages 1, 2, 3, 4, and 5 in model o Stage 5: potential decline (many developed countries this is the case) o Thus there is a lag – birth rates decline only after death rates decline o Developed countries: transition occurred in 1800s; in developing countries: transition occurred in 1900s o Perception is that population growth is a third world problem Is population growth and distribution the underlying problem? Yes (growth step 1, distribution step 2) Real issue: population in relation to carrying capacity o I=PCT (human impact=population x consumption x technology) vs. time o Still in the exponential growth stage, but are starting to see evidence of leveling off o
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