Malthusian ideas about impending starvation or resource exhaustion due to population growth have been popular with intellectuals for a long time but particularly so in the last 100 years. Paul Ehrlich is a well known example. He famously lost his bet with economist Julian Simon on resource scarcity. His prediction in The Population Bomb in 1968 that India would never feed itself was proved wrong that same year. These ideas were generally widely held in intellectual circles (and still are) but there is a long track record of specific predictions relating to these theories that have proved wrong.
Another case that springs to mind: it looks increasingly likely that the mainstream advice on diet as embodied in things like the USDA food guide pyramid was deeply flawed. The dominant theory in the intellectual establishment regarding the relationship between fat, cholesterol and heart disease also looks pretty shaky in light of new research and evidence.
I’d also argue that the intellectual establishment over the latter half of the twentieth century has over emphasized the blank-slate / nurture side of the nature vs. nurture debate and neglected the evidence for a genetic basis to many human differences.
Population/natural resource exhaustion related crises are a bit iffy, because it is plainly obvious that if they remain exponentially growing forever, relative to linearly growing or constant resources (like room to live on), one or the other has got to give.
Mispredicting when it will happen is different from knowing that it has to happen eventually, and how could it not?
Even expanding into space won’t solve the problem, since the number of planets we can reach as time goes on is smaller than exponential population growth rates and demands for resources.
There are definitely plenty of other scientifically held views that get overturned here and there, though—another example is fever, which for centuries has been considered a negative side effect of an infection, but lately it’s been found to have beneficial properties, as certain elements of your immune system function better when the temperature rises (and certain viruses function worse). http://www.newscientist.com/article/mg20727711.400-fever-friend-or-foe.html
Population/natural resource exhaustion related crises are a bit iffy, because it is plainly obvious that if they remain exponentially growing forever, relative to linearly growing or constant resources (like room to live on), one or the other has got to give.
Obviously the people disputing the wrong predictions know this. Julian Simon was just as familiar with this trivial mathematical fact as Paul Ehrlich. The fact that this knowledge led Paul Ehrlich to make bad predictions indicates that his analysis was missing something that Julian Simon was considering. Often this missing something is a basic understanding of economics.
I’m reading The Rational Optimist at the moment which has a few examples.
Malthusian ideas about impending starvation or resource exhaustion due to population growth have been popular with intellectuals for a long time but particularly so in the last 100 years. Paul Ehrlich is a well known example. He famously lost his bet with economist Julian Simon on resource scarcity. His prediction in The Population Bomb in 1968 that India would never feed itself was proved wrong that same year. These ideas were generally widely held in intellectual circles (and still are) but there is a long track record of specific predictions relating to these theories that have proved wrong.
Another case that springs to mind: it looks increasingly likely that the mainstream advice on diet as embodied in things like the USDA food guide pyramid was deeply flawed. The dominant theory in the intellectual establishment regarding the relationship between fat, cholesterol and heart disease also looks pretty shaky in light of new research and evidence.
I’d also argue that the intellectual establishment over the latter half of the twentieth century has over emphasized the blank-slate / nurture side of the nature vs. nurture debate and neglected the evidence for a genetic basis to many human differences.
Population/natural resource exhaustion related crises are a bit iffy, because it is plainly obvious that if they remain exponentially growing forever, relative to linearly growing or constant resources (like room to live on), one or the other has got to give. Mispredicting when it will happen is different from knowing that it has to happen eventually, and how could it not? Even expanding into space won’t solve the problem, since the number of planets we can reach as time goes on is smaller than exponential population growth rates and demands for resources.
There are definitely plenty of other scientifically held views that get overturned here and there, though—another example is fever, which for centuries has been considered a negative side effect of an infection, but lately it’s been found to have beneficial properties, as certain elements of your immune system function better when the temperature rises (and certain viruses function worse). http://www.newscientist.com/article/mg20727711.400-fever-friend-or-foe.html
Obviously the people disputing the wrong predictions know this. Julian Simon was just as familiar with this trivial mathematical fact as Paul Ehrlich. The fact that this knowledge led Paul Ehrlich to make bad predictions indicates that his analysis was missing something that Julian Simon was considering. Often this missing something is a basic understanding of economics.