1. What problem must researchers solve for hydrogen fuel to become a viable energy source?

a. how to reduce the harmful byproducts created by hydrogen fuel

b. how to generate energy by burning hydrogen gas

c. how to produce hydrogen gas without using fossil fuels

2. Which of these factors currently limits the use of CCS methods to offset CO2 emissions?

a. a lack of information

b. a lack of harvesting sites

c. a lack of technology

3. Which of these is a potential drawback of geoengineering?

a. an increase in solar radiation

b. a decrease in the amount of available land

c. a decrease in the availability of food

4. How does a nuclear reactor generate electricity?

a. Special rods regulate the burning of uranium within a power plant's core.

b. Heat from uranium generates steam, which spins a turbine to generate electricity.

c. Radioactive material generates electricity, which turns a turbine.

5. Which statement summarizes the benefits of nuclear power?

a. Nuclear power plants are capable of generating efficient, reliable, low-emission energy for 6 years.

b. Nuclear power is efficient and costs about the same as coal while producing far fewer greenhouse gases.

c. Nuclear power is an efficient, reliable source of energy that emits fewer greenhouse gases than fossil fuels.

6. which of these is a drawback of nuclear energy?

a. CO2 emissions

b. nuclear waste

c. efficiency