In the summer of 2022, China’s Yangtze River Valley (YRV) endured an unprecedented heat wave, severely affecting human society and ecosystems. Traditionally, the extremity of such hot events has been evaluated against a fixed historical baseline (e.g., 1979–2022), suggesting record-breaking magnitudes. However, recent research underscores the significance of the chosen baseline in quantifying these extremes. In the summer of 2022, China’s Yangtze River Valley (YRV) endured an unprecedented heat wave, severely affecting human society and ecosystems. Traditionally, the extremity of such hot events has been evaluated against a fixed historical baseline (e.g., 1979–2022), suggesting record-breaking magnitudes. However, recent research underscores the significance of the chosen baseline in quantifying these extremes. Environment Phys.org – latest science and technology news stories