The video discusses the transition from fossil fuels to renewable energy sources, emphasizing the need for sustainability. It covers various renewable energy types, including biomass, hydroelectric, solar, geothermal, wind, and hydrogen. The video highlights the challenges of energy storage and infrastructure, and the importance of energy return on investment. It also explores the potential of future technologies like hydrogen fuel cells and smart grids.

Why is it important to ensure that renewable energy sources are sustainable?

• Because they are always available

• To prevent environmental degradation

• To increase energy costs

• To reduce energy consumption

What is a major drawback of using wood as a biomass energy source?

• It has a low energy return

• It is not renewable

• It is too expensive

• It leads to deforestation

Which of the following has the highest energy return on investment among renewables?

• Biodiesel

• Solar Power

• Wood

• Corn Ethanol

What is a key advantage of small-scale hydroelectric power?

• It is more efficient than large-scale hydroelectric power

• It has a high return on investment

• It is cheaper to build

• It does not affect river ecosystems

What is the main difference between passive and active solar systems?

• Active systems do not require sunlight

• Passive systems generate electricity directly

• Passive systems use natural heat collection

• Active systems are less efficient

Which country has achieved 100% renewable energy using geothermal and hydroelectric power?

• United States

• Iceland

• China

• Brazil

What is a significant challenge in using hydrogen as a future energy source?

• It is too expensive to produce

• It has a low energy return

• It produces harmful emissions

• It requires a new infrastructure

What is a major benefit of offshore wind turbines?

• They are less affected by weather

• They are cheaper to install

• They do not require maintenance

• They have a high energy return

What is a smart grid designed to do?

• Increase energy production

• Reduce energy costs

• Eliminate the need for fossil fuels

• Efficiently manage energy distribution

Why is energy storage a critical issue for renewable energy?

• Storage is not necessary

• Renewable energy is always consistent

• Fossil fuels are more reliable

• Renewable energy is intermittent