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Why is it necessary to find alternative sources of energy?

Most of our energy requirements are fulfilled by fossil fuels including coal, petroleum and natural gas. Coal and natural gas are the primary fuels for electricity generation and various petroleum products (such as petrol or gasoline and diesel) are used for transportation (in automobile engines). There are some issues with the use of these fuels. They take millions of years to form and hence are in limited quantity. Given our continuously increasing demands for energy, these fuels will likely be exhausted in the foreseeable future. These fuels also generate a number of gases, some of which (such as carbon dioxide) are greenhouse gases and contribute to climate change and global warming.


Thus, there is a serious and urgent need to find alternative sources of energy. These sources must be cleaner and should ideally be renewable. 


Hope this helps. 

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