选题会最受关注的「全球变暖」，我们一口气做了三期特辑 | Knock Knock 世界

Group 1: Global Warming and Its Impact - The "World Weather Attribution Organization" indicates that global warming has increased the likelihood of extreme weather events by several tens to hundreds of times [2] - Global warming has reached 1.55 degrees Celsius, and if no changes are made, it could rise to 3 degrees Celsius or higher [3] - The phenomenon of "heat dome" has been introduced to explain the extreme high temperatures caused by global warming [2][3] Group 2: Economic Opportunities from Domain Sales - The island of Anguilla is projected to earn between $50 million to $70 million by 2025 from selling the ".ai" domain to AI companies, which translates to approximately 300 million to 500 million RMB [3][4] - The registration of the ".ai" domain has surged from 50,000 in 2018 to over 600,000 as of January this year, with major companies like OpenAI, Google, and Apple participating [4] - Some companies are willing to pay as much as $700,000 for a single domain name, highlighting the competitive nature of domain acquisition in the AI sector [4]