Which is the ultimate source of energy?

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

Write two different ways of harnessing energy from the ocean.

Construction of dams submerges large areas of forests,how does this contribute to the greenhouse effect?

Vinod is a member of the school Eco-club. He knows about a school that is a zero-garbage zone. He expressed his willingness to his teachers to implement the same in his school. He decided to place different coloured dustbins for segregating biodegradable and non-biodegradable garbage as the first step. Now answer the following questions.
$(a)$ Why does Vinod want to segregate biodegradable and non-biodegradable waste?
$(b)$ What can Vinod do with the biodegradable waste?

Why is tidal energy not likely to be a potential source of energy?