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In page Green roof:
"A number of European Countries have very active associations promoting green roofs, including Germany, Switzerland, the Netherlands, Norway, Italy, Austria, Hungary, Sweden, the UK, and Greece.[3] Germany was the first country to start developing green roof systems and market them on a large scale.[1] The City of Linz in Austria has been paying developers to install green roofs since 1983, and in Switzerland, it has been a federal law since the late 1990s.[citation needed] In the UK, their uptake has been slow, but a number of cities have developed policies to encourage their use, notably London and Sheffield.
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