Nate is creating a PSA about building a "green” roof. Which source is most reliable for his research?

For research on green roofs, Nate should choose a source focused on ecological roofs and published by a government or nonprofit organization. Such sources are more likely to provide relevant, research-based information than a gardener’s personal blog or a fertilizer company’s advertising website. A photo book may show roof styles but is less likely to explain the topic reliably.

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