1. Burning fossil fuels like coal, oil and gas to turn turbines.

2. Using renewable sources like solar power, wind power, hydro power, and biofuels.

1. The chemical energy in the fuel is converted to thermal energy.

2. Thermal energy is used to heat water into steam, which is then transferred to kinetic energy to turn the turbines.

3. The kinetic energy is transferred to electrical energy in the generator and is eventually transferred to our homes.

1. Solar power

2. Wind power

3. Hydro power

4. Biofuels

Fossil fuels like coal and oil are made from ancient dead organisms.

More can't be created quickly to replace what gets used and fossil fuel reserves are limited.

1. Use energy wisely - turn off appliances and lights when not needed.

2. Shift to LED lights and insulate homes to improve efficiency.

3. Develop more solar and wind renewable energy instead of fossil fuels.

1. Unlimited supply - They won't ever disappear unlike fossil fuels.

2. Reduce reliance on imported polluting fuels.

3. Much lower emissions, which is better for the planet.

1. The supply varies. Solar only works when its sunny and wind turbines need windy days.

2. Storage and backup generators need to be used to ensure a steady supply.