Which country was the first to achieve a fully carbon-neutral parliament/capitol building in 2019, featuring solar panels, rainwater harvesting, and geothermal heating?

Government buildings represent a significant portion of many nations' carbon footprints. In recent years, various governments have launched ambitious sustainability initiatives to reduce the environmental impact of their operations. These range from energy-efficient retrofits to complete carbon-neutral redesigns of government facilities. This trivia question focuses on which country led the way with the world's first carbon-neutral parliament building, setting an example for sustainable governance infrastructure worldwide.

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Sweden
Bhutan
New Zealand
Costa Rica