PDS APES 5th Period 2009-10

Dr. Crumley sent me this one…. Source:http://andrewsullivan.theatlantic.com/.a/6a00d83451c45669e20120a95679e3970b-popup

*A bit late, but a good guest post by Ian N. from the other class.* There are two “Human Population Problems” that we discussed in class on Friday: The Annual Growth Rate (AGR) of a population is too high, leading to problems with overpopulation. The AGR of a population is too low, leading to problems [...]

I’m about to check out and go to bed. Good luck. Just wanted to leave you all with this video that started this lesson. Wonder if we’ll see human population start to level out more in your lifetime? AGR has decreased a tiny bit over the last 50 years…

This is a blog post I’m making as both a personal study tool and a potentially beneficial class review. Enjoy! Urbanization is the demographic shift from rural areas to cities and their outlying urban areas. There are five major global trends regarding this phenomenon that you need to know: More people live in urban areas [...]

In class we discussed human population growth rates in regards to 3 different equations. Each equation took into account certain aspects of population growth, including constant birth rate (CBR), constant death rate (CDR), annual growth rate (AGR), and doubling time. All three of these equations assist us in predicting future populations of any given area [...]

*Note: This is a guest blog by Syd L. in 8th period. Today, we learned about Demographic Transition. It is best illustrated by a graph displaying the CDR (Crude Death Rate), CBR (Crude Birth Rate), and Population size. The model that we use has four stages: The first stage is the pre industrial stage–generally tribal [...]

If you enjoyed the TEDTalk by Hans Rosling, I wanted give a chance to learn more about his work. First, here is today’s video if you want to watch it again: Second, if any of you are interested in more about the stats in the presentation go to Dr. Rosling’s web site: http://www.gapminder.org/ Explore the [...]

A few weekends ago I was reading the Sunday Times and came across an Op-ed that I thought related to our study of human population dynamics. The subject of the article is naming these past ten years, and one Stanford professor suggested we call it the decade of overshoot. He explains that because in the [...]

When studying human population demographics (human population dynamics), the types of studies can be separated into 5 categories: 1)Rates 2)Density 3)Spatial 4)Age Structure 5)Total Size Currently there are approximately 6.7 billion people in the world (6,700,000,000) During class we used a cartogram (a map where each country is rescaled to fit its population) to study [...]

Every Env. Sci. text presents two prototypical growth curves for a population: The “J” Curve (for exponential growth) The “S” Curve (for logistic growth) Each curve is drawn from a few base assumptions: The “J” Curve assumes growth rate is constant, and resources are unlimited.  Growth occurs at the intrinsic rate of growth (r).  So, [...]