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Solar Energy: Solar energy is the solar radiation (from the Sun) that reaches the earth. People have devised two main types of artificial collectors to directly capture and utilize solar energy: flat plate collectors and focusing collectors. Flat plate collectors: These collectors take less space than focusing collectors and they are comparatively cheaper although they cannot provide as much heat. Therefore, flat plate collectors can be used in households or schools in such applications as …

…organic matter in the forest soils is a large reservoir of carbon. Conversion of natural ecosystems to managed energy plantations could result in a release of carbon from the soil as a result of the accelerated decay of organic matter. If biomass is to supply a greater proportion of the world's energy needs in the future, the challenge will be to produce biomass sustainably and to convert and use it without harming the natural environment.