Which of these government sustainability initiatives was FIRST implemented, pioneering the way for green policies in the public sector?

Sustainability has become a critical focus for governments worldwide as they address climate change and environmental degradation. Many administrations have implemented innovative green policies that transform how government agencies operate, from procurement practices to facility management. This trivia question tests your knowledge of landmark government sustainability initiatives that changed the public sector's environmental approach. Can you identify which groundbreaking policy came first and set the stage for governmental green transformation?

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The U.S. Federal Green Challenge (2013)
The UK's Greening Government Commitments (2011)
Japan's Green Purchasing Law (2001)
Germany's Federal Sustainable Development Strategy (2002)