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In the
history of mankind can be seen that fuels, as well as the means of transport
and a without number of inventions require not only knowledge but the
technological capability for exploitation, for centuries used wood, then
coal to the industrial revolution spurred the development of humanity.
Single oil
in the last 150 years has been the technical capacity of out of terrestrial
and submarine grounds to great depth.
In the case
of the nopal, the biogas is used more than 100 years in china and other Asian
countries, but only in 1984 (Contreras and Toha, U of Chile) knowledge generated
that this plant was able to produce large amounts of energy in marginal
growing conditions
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