清华新闻网12月16日电 随着全球气候变化加剧，极端高温天气对人类健康的威胁日益突出。不可补偿热应激是一种极端的热应激状态，即身体散热的能力不足以抵消环境热量的输入，使得健康的个体即使采取充分休息和补水等预防措施，仍然会出现核心体温上升的情况（如不进行干预，热射病和死亡将无法避免）。以往研究主要关注室内环境，假设太阳辐射可以完全避免，但是忽略了无法避免户外活动的脆弱群体，例如全球大约8.5亿农民和7亿需要户外取水的人群。

Venturing outdoors during heatwaves may become deadly for millions of people in a world only slightly warmer than today’s, according to new research that considers the effect of solar radiation, wind and other factors on the human body.

Solar geoengineering — putting aerosols into the atmosphere to reflect sunlight and reduce global warming — is not a fix-all for climate change but it could be one of several tools to manage climate risks. A growing body of research has explored the ability of solar geoengineering to reduce physical climate changes. But much less is known about how solar geoengineering could affect the ecosystem and, particularly, agriculture.