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Towards academic reading

Read this paragraph and answer the question below.

Global Warming and Energy Substitutes

 

Some scientists claim that global warming is caused by the release of 'greenhouse gases' into the atmosphere. These gases are caused mainly by energy sources which contain carbon. This is why scientists are encouraging initiatives to find energy substitutes that are both carbon-free and economical.

Which sources may be good energy substitutes that would reduce global warming? Choose the 2 correct answers.

solar energy (uses power from the sun and can operate alongside other energy sources)

coal (may be burned to produce energy and releases large amounts of carbon)

wind power (produces electricity by turning a turbine)