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Exploring Renewable Energy: Types, Advantages, and Disadvantages

Learn about renewable energy sources including solar, hydroelectric, geothermal, wind, and biomass. Understand their benefits like lower emissions and drawbacks such as environmental impact. Discover how these sources can combat global warming and why transitioning to renewable energy is crucial for a sustainable future.

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Exploring Renewable Energy: Types, Advantages, and Disadvantages

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  1. Renewable Energy Chan Chun Wa (02) Luk Chun Kit (23) Ma Kung Leung (24) Ng Man Fung (28)

  2. What is renewable energy? • Derived from natural processes • Replenished constantly • From the sun or heat generated deep within the earth • Will not produce waste to affect our environment and health

  3. Different type of renewable energy • Wind energy • Hydroelectric power • Solar energy • Geothermal energy • Power from biomass

  4. Solar Energy • Use solar cells • Store excess electricity by rechargeable batteries • Solar energy also can apply in different electronics • Adv.1.Do not produce greenhouse gas 2.Inexhaustible source • Disadv.1.Costly 2.Pollution occur when produce solar cells

  5. Hydroelectric power • Through gravitational force to generate electricity falling or flowing water • The most widely used form of renewable energy • E.g. Tidal power • Adv.1.No direct waste 2.Lower output level of the carbon dioxide (CO2) 3.Can become tourist attractions • Disadv.1.Damage aquatic habitat & ecosystems 2.Changes the downstream river environment 3.Diminished river flow Shortages in power

  6. Geothermal energy • Thermal energy generated and stored in the Earth • When cold water flow  Steam & hot water produced  Steam used to turn turbines  Generate electricity!! • Expected to become the most competitive green energy and global warming in the rescue program.

  7. Adv.1. New technology Regardless of location and climate 2.Provide stable power 3.Construction time and cost are far less than nuclear power Disadv.1.Less carbon dioxide (CO2), methane (CH4) and ammonia (NH3) 2.Possible cause Earthquake 3.Scattered distribution development is difficult

  8. Wind Energy • Using wind turbines to make electricity • Only little greenhouse gas emission during operation • Adv.1.Consumes no fuel & water 2.Emits no air pollution • Limited: 1.Place 2.Wind speed not constant Cannot generate electricity

  9. Power from biomass • Biomass=organic matter (both plant & animal materials, waste substances) • Most common:1.Bioethanol—alcohol (by fermenting sugar of plant) 2.Biodiesel--from vegetable oils • Adv.1.Biodegradable 2.Cost lower than using fossil fuel 3.Reduce levels of particulates, carbon monoxide • Disadv.1.Damage habitat 2.Food price increase

  10. Overall view

  11. Conclusion Global Warming deteriorate continuously ,but we think these renewable energy may improve the environmental issues effectively. We should use the renewable energy replace fossil fuels, reduce pollution of air, ocean and land. Renewable energy is unlimited, so renewable energy is more important than fossil fuel. In the future, we hope to renewable energy replace fossil fuels in each country .

  12. End

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