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Limits to Growth was Wrong

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Posted in Science on 27th Jun, 2013 05:06 AM by AlexMuller

In the early 1970s, the flush of technological optimism was over, the Vietnam War was a disaster, societies were in turmoil, and economies were stagnating. Rachel Carson’s 1962 book Silent Spring had raised fears about pollution and launched the modern environmental movement; Paul Ehrlich’s 1968 title The Population Bomb said it all. The first Earth Day, in 1970, was deeply pessimistic.


The genius of The Limits to Growth was to fuse these worries with fears of running out of stuff. We were doomed, because too many people would consume too much. Even if our ingenuity bought us some time, we would end up killing the planet and ourselves with pollution. The only hope was to stop economic growth itself, cut consumption, recycle, and force people to have fewer children, stabilizing society at a significantly poorer level.


That message still resonates today, though it was spectacularly wrong. For example, the authors of The Limits to Growth predicted that before 2013, the world would have run out of aluminum, copper, gold, lead, mercury, molybdenum, natural gas, oil, silver, tin, tungsten, and zinc.


Instead, despite recent increases, commodity prices have generally fallen to about a third of their level 150 years ago. Technological innovations have replaced mercury in batteries, dental fillings, and thermometers: Mercury consumption is down 98 percent and, by 2000, the price was down 90 percent. More broadly, since 1946, supplies of copper, aluminum, iron, and zinc have outstripped consumption, owing to the discovery of additional reserves and new technologies to extract them economically.


Similarly, oil and natural gas were to run out in 1990 and 1992, respectively; today, reserves of both are larger than they were in 1970, although we consume dramatically more. Within the past six years, shale gas alone has doubled potential gas resources in the United States and halved the price.


As for economic collapse, the Intergovernmental Panel on Climate Change estimates that global GDP per capita will increase 14-fold over this century and 24-fold in the developing world.


The Limits of Growth got it so wrong because its authors overlooked the greatest resource of all: our own resourcefulness. Population growth has been slowing since the late 1960s. Food supply has not collapsed (1.5 billion hectares of arable land are being used, but another 2.7 billion hectares are in reserve). Malnourishment has dropped by more than half, from 35 percent of the world’s population to under 16 percent.


Nor are we choking on pollution. Whereas the Club of Rome imagined an idyllic past with no particulate air pollution and happy farmers, and a future strangled by belching smokestacks, reality is entirely the reverse.


In 1900, when the global human population was 1.5 billion, almost 3 million people – roughly one in 500—died each year from air pollution, mostly from wretched indoor air. Today, the risk has receded to one death per 2,000 people. While pollution still kills more people than malaria does, the mortality rate is falling, not rising.
Nonetheless, the mindset nurtured by The Limits to Growth continues to shape popular and elite thinking.



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