Step 1: Understanding the Question:
The question asks to identify the primary benefit of renewable energy according to the text.
Step 2: Locating the Information in the Passage:
The passage explicitly points out the main advantage.
It says: "One of the main advantages of renewable energy is that it is environmentally friendly." The following sentences elaborate on this by stating that it doesn't produce greenhouse gases or harmful pollutants.
Step 3: Final Answer:
According to the passage, the main advantage is its environmentally friendly nature.