Twenty-seven years ago, Ronald Sakolsky saw Yin Yuzhen's story on CCTV while teaching in China and was so moved that he donated $5,000 to support her fight against desertification. Now, he's back in China, and the two are finally reuniting. CGTN host Tian Wei has interviewed Sakolsky several times over the past few months. And when he heard her voice at the airport, he recognized her right away. After 27 years, a promise, a friendship, and a shared belief in a greener future have come full circle. What did these old friends say to each other? Stay tuned for more.