Which government sustainable procurement initiative was first to require vendors to meet specific carbon footprint reduction targets to qualify for government contracts?

Government agencies worldwide are increasingly adopting sustainable procurement policies to reduce environmental impact and promote eco-friendly practices. This trivia question tests your knowledge of how government sustainability initiatives are transforming public sector purchasing and influencing retail markets. Can you identify which landmark sustainability policy has had the most significant impact on government procurement practices?

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The EU Green Public Procurement (GPP) criteria of 2008
The US Federal Green Challenge launched in 2011
The UK Greening Government Commitments established in 2010
Japan's Green Purchasing Law enacted in 2001