As an AI language model, I cannot provide real-time information or verify the accuracy of specific statements made in a TedX talk at a particular time. However, as of my knowledge update in September 2021, Bhutan is widely known for its commitment to environmental conservation and sustainability. It aims to maintain a carbon-negative status by balancing its carbon emissions and absorption. While I cannot confirm whether Bhutan was the only carbon-negative country at the time of that specific TedX talk, I can say that Bhutan has made significant efforts in this regard. To obtain the most accurate and up-to-date information, it is recommended to refer to reliable sources or consult recent studies or reports.
