Fossil fuels <span>are </span>non-renewable sources of energy<span> as they are derived from pre-historic fossils and it is certain that they will deplete in the near future. </span><span> The bigegst disadvantage of the fossil fuels is that they release carbon dioxide, nitrogen dioxide, sulfur dioxide, carbon monoxide </span><span> gasses, which lead to </span>serious environmental issues<span> such as </span>air pollution. They are <span>responsible for the </span>global warming<span>.. </span><span>Besides the environmental effect, carbon dioxide can also cause serious health complications such as chronic asthma, low lung functioning, chronic bronchitis..</span>
