Write the general principle involved in generating nuclear energy. Name one fuel used in a nuclear reactor.

Choose the incorrect statement.

What are the environmental consequences of using fossil fuels? Suggest the steps to minimize the pollution caused by various sources of energy,including non-conventional sources of energy.

Compare the energy produced during the fission of a uranium atom with the energy produced due to the combustion of a carbon atom from coal.

Which gas is present both in natural gas and biogas?

There are about $50$ teachers in a school and most of them come to school by their own cars. Many of the teachers come from the same place but everyone prefers to come to school by his/her own car.
Answer the following questions based on the above information:
$(a)$ Do you think that their practice of commuting to school is environmental-friendly? Give one suggestion. Justify your answer.
$(b)$ In what other two ways can we become environmental-friendly?