Question

add hyphens to compound adjectives where necessary. if no hyphens are needed, submit the text without making any changes. geothermal energy, hydroelectricity, solar power, and wind power all produce carbon neutral energy.

Explanation:

Compound adjective "carbon - neutral" needs a hyphen as it modifies "energy".

Answer:

Geothermal energy, hydroelectricity, solar power, and wind power all produce carbon - neutral energy.