[MCN] Water requirements of urban agriculture

[Lance Olsen]

Sample quote: "Over the 75 day cropping cycle, median crop water 
requirements as ETc were 17% less than that required for a 
well-watered grass (as ETo). If all lawns in our modeled area were 
replaced with crops, we estimate that about 37% of the resident 
population could obtain the vegetable portion of their diet from 
within the local area over a 150 day growing season. However doing so 
would result in augmented water demand if watering restrictions apply 
to lawns only. The CityCrop model can therefore be useful to evaluate 
trade-offs related to urban agriculture and to inform municipal water 
policy development."

Full article, open access, here:
http://iopscience.iop.org/1748-9326/10/6/064007/article
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"The most likely way the climate could be influenced by either 
natural or artificial means seems to be through a trigger mechanism 
that ultimately changes the radiation balance .... the burning of 
fossil fuels would presumably lead to more absorption of long-wave 
terrestrial radiation in the atmosphere and consequently to greater 
heating."

Abraham Oort.  "The Energy Cycle of the Earth,"
Scientific American. September 1970
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"The molecule of carbon dioxide has strong absorption bonds, 
particularly in the infrared region of the spectrum at wavelengths of 
from 12 to 18 microns. This is the spectral region where most of the 
thermal energy radiating from earth to space is concentrated. By 
increasing the absorption of this radiation ... the carbon dioxide 
reduces the amount of heat energy lost by earth to outer space."

Fred S. Singer, "Human Energy Production as a process in the biosphere,"
Scientific American, September 1970.





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