ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವ ದೇಶವು ಮೊದಲು ಕಾರ್ಬನ್-ನೆಗೆಟಿವ್ ಆಯಿತು?

Bhutan is the world's first carbon-negative country: its forests absorb more carbon dioxide than the country emits, and its constitution requires at least 60% forest cover.