Hi, y'all
Perhaps this is not what y’all might have expected to hear in a Renewable Energy / Peak Oil forum.
I’ll precede the recommended reading with a question: What are you going to eat as the oil runs out?
From Eating Fossil Fuels by Dale Allen Pfeiffer
The full article is available at http://www.fromthewilderness.com/free/ww3/100303_eating_oil.html
Just when agricultural output could expand no more by increasing acreage, new innovations made possible a more thorough exploitation of the acreage already available. The process of “pest” displacement and appropriation for agriculture accelerated with the industrial revolution as the mechanization of agriculture hastened the clearing and tilling of land and augmented the amount of farmland which could be tended by one person. With every increase in food production, the human population grew apace.
At present, nearly 40% of all land-based photosynthetic capability has been appropriated by human beings.2 In the United States we divert more than half of the energy captured by photosynthesis.3 We have taken over all the prime real estate on this planet. The rest of nature is forced to make due with what is left. Plainly, this is one of the major factors in species extinctions and in ecosystem stress.
The Green Revolution
In the 1950s and 1960s, agriculture underwent a drastic transformation commonly referred to as the Green Revolution. The Green Revolution resulted in the industrialization of agriculture. Part of the advance resulted from new hybrid food plants, leading to more productive food crops. Between 1950 and 1984, as the Green Revolution transformed agriculture around the globe, world grain production increased by 250%.4 That is a tremendous increase in the amount of food energy available for human consumption. This additional energy did not come from an increase in incipient sunlight, nor did it result from introducing agriculture to new vistas of land. The energy for the Green Revolution was provided by fossil fuels in the form of fertilizers (natural gas), pesticides (oil), and hydrocarbon fueled irrigation.
The Green Revolution increased the energy flow to agriculture by an average of 50 times the energy input of traditional agriculture.5 In the most extreme cases, energy consumption by agriculture has increased 100 fold or more.6
In the United States, 400 gallons of oil equivalents are expended annually to feed each American (as of data provided in 1994).7 Agricultural energy consumption is broken down as follows:
· 31% for the manufacture of inorganic fertilizer
· 19% for the operation of field machinery
· 16% for transportation
· 13% for irrigation
· 08% for raising livestock (not including livestock feed)
· 05% for crop drying
· 05% for pesticide production
· 08% miscellaneous