- Jan 28, 2003
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PHenry42, first let me thank you for addressing this issue in a kind and civil manner, without resorting to personal attacks and repeated misrepresentations of others. It is indeed a pleasure to discuss these things with people who know how to discuss differences in a civil manner. Thank you very much.
These figures are average values based on the sustainable average capacity of the earth to produce necessities and remove wastes per hectare, and the average consumption of humans. The report says we use more than the sustainable capacity of the earth, and that is why the usage number is greater than the capacity number. It is not a statement that everybody uses exactly this many acres, or that every acre has exactly this value to humanity.
If those processes are not economically profitable now, will not the price become much higher when the fuel to do these processes increases? Desalination can be done using unsustainable draws of fossil fuels, but how will you do significant desalination when the cheap fossil fuels are gone? Solar cells and windmills consume enormous amounts of energy just to build the equipment. If future generations are asked to invest enormous amounts of energy into building solar panels to power desalination plants, would they be able to even afford this?
Much of the calculated overshoot consists of prosperous countries consuming meat that requires far more acres per person than bread does. If we could only change our diets to require less grain, it would do a lot to solve the problem.
Voluntary efforts to consume less meat will help. But if we really needed to reduce 60% of worldwide grain production, it would probably require some sort of government action. If government action to reduce meat consumption could minimize future starvation, would you be in favor of such action? What would you want the government to do?
I suggest that you read the actual study. The 2010 version is at http://www.footprintnetwork.org/press/LPR2010.pdf .First it says that there are 11.2 billion hectares of biosphere. Then it quotes another source which says that we are currently using 13.5 billion hectares of biosphere for economic use. In other words, we are using more than 100% of the earth's surface! We are, according to their analysis, using land that doesn't exist! There's a contradiction in numbers here and the suggestion of a theoretical impossibility, not a case of overexploitation.
These figures are average values based on the sustainable average capacity of the earth to produce necessities and remove wastes per hectare, and the average consumption of humans. The report says we use more than the sustainable capacity of the earth, and that is why the usage number is greater than the capacity number. It is not a statement that everybody uses exactly this many acres, or that every acre has exactly this value to humanity.
The earth has, even today, massive unused food production capacity. We could eat plankton from the sea. We could distill fresh water out of the saltwater of the seas. We could recycle our poo if we used it to fertilize our farms instead of using chemical fertilizer. None of these are economically feasible atm, but are reserves that can be tapped into on necessity (which it will be economically profitable to do if food prices rise due to alleged shortage).
If those processes are not economically profitable now, will not the price become much higher when the fuel to do these processes increases? Desalination can be done using unsustainable draws of fossil fuels, but how will you do significant desalination when the cheap fossil fuels are gone? Solar cells and windmills consume enormous amounts of energy just to build the equipment. If future generations are asked to invest enormous amounts of energy into building solar panels to power desalination plants, would they be able to even afford this?
This is a most excellent point, and deserves to be displayed on this thread in flashing bold red letters.Not to forget that, of current world grain production, about half goes to animal fodder. Meaning that grain turns to meat, but at a conversion that retains at most something like 20% of the input energy. If we stopped using grain to feed animals and instead ate the grain directly, we'd double the total number of calories available for humanity.
Much of the calculated overshoot consists of prosperous countries consuming meat that requires far more acres per person than bread does. If we could only change our diets to require less grain, it would do a lot to solve the problem.
Voluntary efforts to consume less meat will help. But if we really needed to reduce 60% of worldwide grain production, it would probably require some sort of government action. If government action to reduce meat consumption could minimize future starvation, would you be in favor of such action? What would you want the government to do?
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