1. Organic farming is a holistic approach that seeks to develop an understanding of the webs of interaction among the myriads of organisms that form the flora and fauna of the field.
2. The organic farmer works to create a system where the insects (called pests) are not eradicated, but kept at manageable levels by a complex system of checks and balance within a living and vibrant ecosystem.
3. According to the organic farmer, the eradication of the creatures, called pests, is not only possible but also undesirable, because many beneficial predatory and parasitic insects cannot survive without them.
4. Such a use of biocontrol measures reduces the use of chemical pesticides and thereby the pollution.

  'A' = Saccharomyces cerevisiae ; 'B' = Acetic acid

A sewage treatments plants is regarded as a giant microbial culture breading facility where the microbes are persuaded to work for our benefit.They metabolize the solid waste that passes through the treatment plant.The microbes oxidize the nutrients and during this process, they release energy in the form of heat and chemicals (phosphates, nitrates and sulphates) Gaseous by-product is also produced in the form of carbon dioxide.

The name of gobar gas (or biogas) is methane.It is generated by the activity of methanogenic bacteria (i.e., methane producing anaerobic bacteria). Following are advantages of using methane as a source of energy:
(i) Methane is insoluble and therefore, separates very easily from the fermentor.
(ii) It can be very easily pressurized or liquefied for storage
(iii) It is readily combustible.

Setting up of a gobar gas plant or biogas plant.