As we are sort of energy sources can we jointlu make a simple instrument or any device or any device which uses solar energy or water energy or wind energy for its fuel. By this we can give light to many many homes almost freely.
the topic energy is too broad there are many companies, ngo try to doing that as fuel get more expensive everyday may be few more decades fossil fuel will be run out.
solar engery are wast but for development of the solar panel or the price still too expensive for many people.