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Fossil fuel is the main source of energy. In some countries, the use of alternative sources of energy is encouraged . To what extent do you think is it a positive or negative development? For many years, fossil fuel has been the main source of energy and this issue has had a negative effect on natural resources and human life. Therefore, authorities are encouraged to use alternative resources instead of fossil fuel. Personally, I feel it is a positive development . On the one hand, fossil fuels such as oil, coal and gas are natural resources which are unfortunately are not sustainable. During the years using them excessively them has been the leading cause of their running out. There are many countries that where fossil fuel is the lone/lonely/single/only alone energy resource for different consumptions. Furthermore, combustion of fossil fuel is not clean and for this reason there is tremendous air pollution in many places all over the world. In recent years, in some developed countries other options as energy are suggested to people. For instance, some cars that work by electricity, to some extent have been common instead of other cars that are clean than fossil fuels. On the other hand, some alternative sources can be considered like nuclear, solar, wind, and water energy. These energies are clean, economical, and renewable compared to/than fossil fuels. In some countries such as India, and American a huge amount of energy that they need them, are supplied from wind, and solar power. For example, installing solar plates/panels on the roofs of houses for generating electricity is a positive improvement. In addition, nuclear power is very/quite common in many countries as an energy resource. Although some believe that nuclear energy is not reliable, and safe, many developed countries have improved with it. In conclusion, we should try to use sustainable energy sources via which we could save fossil fuels and also having clean air without pollution.