Which country's parliamentary building became the world's first carbon-neutral capitol building in 2008, utilizing geothermal heating, solar panels, and running entirely on renewable energy?

In recent years, governments worldwide have embraced sustainability initiatives to combat climate change and demonstrate environmental leadership. Many national and local governments have implemented ambitious green policies, from renewable energy mandates to plastic bans. But which government can claim the distinction of establishing the world's first carbon-neutral capitol building? Test your knowledge of governmental environmental leadership with this trivia question about pioneering sustainability in government infrastructure.

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Sweden
Iceland
New Zealand
Denmark