Which pioneering government sustainability initiative became the world's first carbon-neutral parliament building in 2008, featuring rainwater harvesting and solar panels?

Government sustainability initiatives have become increasingly important in the fight against climate change and environmental degradation. Public sector organizations worldwide are implementing innovative strategies to reduce their environmental footprint while promoting sustainable practices among citizens. How well do you know the landmark sustainability programs that have transformed government operations? Test your knowledge about significant public sector environmental initiatives that have set new standards for sustainable governance.

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The Reichstag (German Parliament Building)
The Houses of Parliament (UK)
The Capitol Building (USA)
The National Diet Building (Japan)