In the case of nuclear fuel, some of the decaying radioactive wast products, have half-lives of years. Wood, on the other hand is a renewable form of energy, since carbon-based waste gas is a building block for new generation trees. The process of photosynthesis, by which solar energy regenerates carbon dioxide into oxygen and carbon, makes this possible. CO 2 emissions from combusted wood are consequently renewed to their original state, namely wood and oxygen. This form of energy is sustainable as long as the source of wood is continuously and adequately replenished through replanting.
Solar energy captured during photosynthesis is released when the wood is burnt.
Other forms of renewable energy include solar, wood and organic material, and the digestive product of organic material, called biogas. Biogas is formed in landfill sites as well as in digesters through the anaerobic decomposition of organic matter, including sewerage, household garbage, garden refuse, paper, and other natural organic material, commonly known as biomass. This increases atmospheric temperatures, which in turn lead to the melting of the ice caps and general climatic changes. The Cost of Waste When we expel domestic waste we pay for suitable disposal. Of course this disposal has associated costs and a turning point will be reached when societies begin to pay directly or indirectly for the consequences of unchecked emissions.