Which pioneering government sustainability initiative was the first to require that at least 95% of all new government contract spending had to meet mandatory green procurement criteria?

In recent years, governments worldwide have been implementing sustainability initiatives to reduce their environmental footprint and lead by example. One significant area of focus has been green procurement policies that influence billions in public spending. Test your knowledge about how these policies are transforming the relationship between government purchasing power and environmental protection.

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South Korea's Green Public Procurement Program (2005)
The United States Federal Green Challenge (2011)
The European Union Green Public Procurement Policy (2008)
Japan's Green Purchasing Law (2001)