Why are fossil fuels non renewable energy sources?

Answer 1

nuclear fuel comes from radio active substances like uranium, plutonium etc., hence uranium etc., will be required to produce energy....only limited supply of uranium etc is there in earth...once this is used up nuclear energy can't be produced...unlike wind energy which is renewable because as long as the wind blows energy is produced... so its renewable...but its not the case in nuclear energy which depends on the availability of radioactive substances....conservation of energy is thus necessary for the future....

Answer 2

Because we can only use them once. When we've burnt them, they've gone. This is the opposite of renewable sources of energy like sunshine or wind power which we can keep on using over and over.

Answer 3

They are non-renewable because once they are used up, they are gone. Sure, stuff continues to decay on earth and creates deposits in the soil, but not at the rate we need for sustaining the current level of usage forever.

Answer 4

Nuclear power is an alternative energy source and is virtually unlimited in it's power, but is, strictly speaking, not renewable.

To meet the requirements of being renewable the energy source being used must be replenished faster than we consume it. This is not the case for Uranium.

Answer 5

Because there is a finite amount of fuel- uranium in the world, and eventually we will run out.