Green roofs may provide more sustainable benefits than cool roofs but might cost more to install, according to this article. Extensive or intensive green roofs can protect a roof from sunlight, control stormwater runoff and reduce pollution but cost "between $15 to $20 per square foot" to install, according to the "Urban Design Tools: Low Impact Development." Meanwhile, cool roofs reflect heat more than traditional roofs and cost $0.75 to $1.50 per square foot to install, according to the EPA.gov website.

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