2023-01-06

封面图展示的是来自尼泊尔坤布冰川的融水正流经一个冰洞。根据对未来温室气体排放的推测，到21世纪末，全世界范围内预计有49%～83%的冰川会消失。考虑到质量的损失直接关系到温度的变化，因此温度的每一次升高都至关重要。随着冰川对气候变化作出反应，我们的社会必须尽量适应水资源、自然灾害及海平面等方面的相应变化。

Meltwater from Nepal’s Khumbu Glacier drains through an ice cave. By the end of the 21st century, 49 to 83% of the world’s glaciers are projected to disappear depending on future greenhouse gas emissions. Given that mass loss is directly related to temperature changes, every increase in temperature matters. As glaciers respond to climate change, societies must adapt to changes in water availability, natural hazards, and sea level.

2023-01-13

封面图展示的是一幅艺术家的构想画面，一颗距离地球700光年的恒星发出的光在WASP-39b（一颗富含水的气体巨星）浓雾般的云顶上闪烁。2022年11月，天文学家使用美国宇航局的巨型太空望远镜——詹姆斯·韦布空间望远镜报告说，在WASP-39b的天空中探测到二氧化硫，这就是雾霾的成因。雾霾可以掩盖行星的大气层，而在实验室中重现它们就可以帮助科学家解开其隐藏的秘密。

In this artist's conception, light from a star 700 light-years from Earth glints off the soupy cloud tops of WASP-39b, a water-rich gas giant. In November 2022, astronomers using JWST, NASA’s giant space telescope, reported detecting sulfur dioxide—a contributor to smog—in WASP-39b’s skies. Hazes can obscure a planet’s atmosphere, but recreating them in the laboratory could help unlock their secrets.

2023-01-20

封面图展示了一个不寻常的环丙二烯化学结构。在三个碳原子的线性排列中，二烯烃通常包含2个连续的双键。而环内的限制会产生弯曲的几何形状，从而产生应变和高反应性。这种增强的反应活性使lissodendoric酸A的高效全合成成为可能，lissodendoric酸A是一种复杂的天然产物，因其抗氧化特性而具有药用价值。

This image illustrates the unusual chemical structure of a cyclic allene. Allenes typically contain two consecutive double bonds in a linear arrangement of three carbon atoms. Confinement in a ring instead enforces a bent geometry that produces strain and thus high reactivity. This enhanced reactivity enabled an efficient total synthesis of lissodendoric acid A, a complex natural product of pharmaceutical interest for its antioxidant properties.

2023-01-27

封面图上展示的是在巴西帕拉州贝尔特拉市种植的大豆田，由于人类活动，亚马逊森林正在迅速变化，包括为发展农业而砍伐森林。剩余的森林地区正在经历火灾、干旱和邻近土地使用的影响。这些变化威胁到了当地生物多样性及社区，并且正在改变全球气候。

The Amazon forest is changing rapidly as a result of human activities, including deforestation for agriculture, such as these soybean fields in Belterra, Pará, Brazil. Remaining areas of forest are experiencing an increased incidence of fires, drought, and the effects of neighboring land uses. These changes threaten local biodiversity and communities and alter the global climate.