A | (ECNS) -- Hot days worldwide could experience around four additional hours of extreme heat by the end of the 21st century under a high-emissions scenario, according to a study led by Chinese researchers. Published in Nature Climate Change, the study found that traditional daily temperature indicators may overlook shorter periods of extreme heat, while hourly temperature analysis can provide a more detailed picture of heat exposure and associated risks. Researchers from Sun Yat-sen University and other institutions analyzed global hourly temperature data from 1981 to 2023, combining observational records with climate model projections to assess how extreme heat exposure could change in the future. The research team found that the duration of extreme heat increased by 62 hours per decade over the study period. Around 28% of extreme heat events occurred on days that would not have been classified as hot days based on conventional daily temperature indicators. Under a high-emissions scenario known as SSP5-8.5, the researchers projected that between 2070 and 2099, each hot day could experience around four additional hours of extreme heat compared with the 2001-2023 period. Days not classified as hot could also see increased periods of extreme heat. The study also found that low- and middle-income countries account for a disproportionately large share of both current and projected extreme heat exposure. Younger generations in low-income countries are expected to experience the greatest increase in lifetime exposure. Researchers said the findings could help improve heat-warning systems, strengthen assessments of health risks and support climate adaptation efforts. (By Helen Mo, intern Liu Shuangjing) 
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B | 力箭系列运载火箭近日迎来两个“首次”：力箭一号完成海上发射箭地联合演练，首次海上发射进入倒计时；力箭二号遥二运载火箭顺利出厂，将首次执行低轨星座规模化组网发射任务。
C | 力箭一号是中科宇航研制，用于微小卫星、中低轨道快速组网发射的中型固体运载火箭。8月25日，它完成了海上发射联合演练，全程模拟发射当日流程，开展发射架起竖等十余项试验，后续它将在广东附近海域执行“一箭3星”任务，这是它的首次海上发射。
D | 此外，力箭系列另一款火箭——力箭二号也迎来新进展。力箭二号是该系列的液体运载火箭，相比于力箭一号，它的运载能力更强，可以实现低轨星座规模化组网，计划今年10月执行一箭18星发射任务。 中科宇航力箭二号运载火箭副总设计师 李秦峰：目前力箭二号遥二运载火箭已完成全部的出厂评审工作，各项性能指标完全满足飞行要求。本次火箭总装测试周期相比首飞实现缩短，标志着力箭二号向标准化、批量化研制发射的方向稳步迈进。 (央视新闻客户端 总台央视记者 崔霞) 【编辑:黄嘉雯】。
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