1. How many sources of energy are there? What are they? 2. What type of energy source is wind/wave/solar/hydro/nuclear...? What type of energy source is coal/oil/natural gas...? 3. Talk about the advan...

1. There are several sources of energy, including: - Fossil fuels (coal, oil, natural gas) - Nuclear energy - Renewable energy sources (wind, solar, hydro, geothermal, biomass) 2. Wind, wave, solar, and hydro energy are all types of renewable energy sources. Nuclear energy is a non-renewable source of energy. Coal, oil, and natural gas are all fossil fuels. 3. Advantages and disadvantages of each type of energy source are as follows: Fossil fuels: - Advantages: abundant, reliable, relatively cheap - Disadvantages: non-renewable, contribute to climate change, air pollution, environmental damage from extraction Nuclear energy: - Advantages: low carbon emissions, reliable, efficient - Disadvantages: nuclear waste disposal, potential for accidents, high cost Renewable energy sources: - Advantages: clean, renewable, low carbon emissions, sustainable - Disadvantages: intermittent availability, high initial cost, land use requirements 4. We have to save energy because it helps to reduce our impact on the environment and conserve natural resources. Saving energy also helps to reduce our energy bills and can improve energy security. 5. To save energy, we can: - Use energy-efficient appliances and light bulbs - Turn off lights and electronics when not in use - Adjust thermostats to conserve heating and cooling energy - Use public transportation, carpool, or walk/bike instead of driving alone - Reduce water usage by fixing leaks and taking shorter showers - Use renewable energy sources whenever possible.