What is the main idea of a paragraph about renewable energy's impact on emissions?

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The main idea is that renewable energy lowers greenhouse gas emissions by displacing fossil fuels in electricity generation. When power comes from renewables, less coal, oil, or gas is burned, so overall emissions decrease. Solar, wind, and hydro produce electricity without combustion, which directly reduces the pollutants released by the energy system. The paragraph’s focus is on this emission-reducing effect, not on other issues. The other statements don’t fit because they either claim there’s no impact, limit renewables to a narrow setting, or bring up resource use without addressing how emissions change.