The document reflects on the author's experience at COP16 in Cancún, focusing on discussions surrounding building energy efficiency, highlighting successful initiatives like Mexico's zero energy low-cost housing program. It emphasizes the need for urgent action on decarbonization as indicated by the IEA's findings, while also noting the lack of public engagement compared to previous conferences like Copenhagen. The author suggests that genuine cooperation, rather than competition, might be more effective in addressing climate change challenges.