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This video’s reasoning seems logical at first blush, but it’s actually full of crap. The video claims that the rate of population growth is decreasing because the population doubles slower each time it doubles, when mathematically if there were 100 people and ten more people are added each year, it would take 10 years for it to double to 200, 20 years for it to double to 400 etc, even if the population were expanding at a steady rate. The video then attempts to make the situation even more confusing by using the analogy of a roller coaster full of people that climbs up a hill slower and slower the more people are added to it, which seems to “makes sense”, but because of weight and gravity in the illustration, not because of anything to do with population dynamics. The entire human population doesn’t need to be pulled up a hill for more people to be born.
Now that being said one claim of the video is actually correct, namely that the rate at which human population is expanding is decreasing – but it’s decreasing because people have been working for decades to do things which decrease the rate of population growth, like getting women into the workplace in poor countries so they have more options in life than to just have lots of children. The video was taken from the website overpopulationisamyth.com. Yes, the rate of population growth is slowing, but it would be expanding like gangbusters if people around the world actually believed what this website promotes. Oh, and as I said on the blog of the person who first linked to the video, the “institute” that made the video is a conservative organization funded by the ultra-conservative half-trillion dollar trust which funds neoconservative groups like Project For The New American Century which heavily promoted bush’s foreign policy.
I just thought it was a good example of steaming bullshit that you all might find interesting.