Alternative sources are the necessity of the present and future for two significant reasons: their limited quantity and the pollution potential of fossil fuels.
Fossil fuels have driven and are driving our development. However, there is only a limited quantity of fossil fuels in this world. The reason for this is simple. It takes millions of years for these fuels to form and hence they are also called non-renewable resources. Given the ever increasing demand for fuels, we are in the danger of running out of these fuels in the next 50-100 years or so.
Another issue with fossil fuels is the generation of carbon dioxide and other greenhouse gases upon combustion. These gases are the main cause of global warming and climate change. A lot of emphasis is being placed on replacing these fuels to prevent or minimize the impacts of climate change.
Thus, sooner or later we will have to replace these fossil fuels with alternative energy sources, such as solar power, wind power, etc.
Hope this helps.
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