Hey Aspirant ,

As per your mentioned query, i would like to suggest some methods so that we can reduce the non polluting energy system with some good references. They are :

• Smokeless chullahas : In developing countries like india , the energy needs of rural poor are mostly met with by burning firewood. These methods are not good for us as well as our environment too. So, indian scientists coming up with smokeless chullahas. These chullahas are smokeless , permit shorter cooking time and also saves fuel.
• Energy from city sewage : The city sewage treatment plants use anaerobic digestion units for extracting methane from human night soil which is in the form of a sludge. The gas generated from the sludge is called sludge gas , which like biogas consists of methane. The department of non conventional energy sources has supported setting up sewage based biogas plants in UP, MADHYA PRADESH, DELHI.
• Solar energy : Biogas is a cheap and efficient fuel and it's feedstock os renewable. Systematic efforts are being made to tap solar energy for meeting the demands of our rural poor. It is a decentralised energy system, which can be used to meet versatile needs of the indian masses.

I hope this will be helpful.

Revert back if any query.

Thank you !!