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作者：NicolasLeeFreud
图片源自推特
如果能把“二氧化碳”变成燃料， 那该多好。
经过过去二十年的努力，中国已成为全球温室气体的主要排放国。虽然中国的人均排放只有美国的一半，但庞大的人口总数，加上快速发展的经济，让中国跃居成为最大的排放国家。
目前大部分西方国家排放趋于稳定，但中国的排放仍然在大幅增长。
图片源自推特
根据 2015 年的巴黎气候协议，中国承诺在 2030 年前排放量达到峰值和趋于稳定。三明哈佛中国项目的研究人员在《Nature Sustainability》期刊上发表论文，根据中国 50 个城市的排放数据，认为对中国的排放 2025 年前将达到峰值。
这 50 个城市占到了全国排放的 35%，人口的 30%，GDP 的 50%。研究人员观察到证据显示这些超级城市存在名为环境库兹涅茨曲线的经济关系，即人均 GDP 达到某个值之后排放趋于稳定。
图片源自推特
根据世界银行的预测，中国预计到 2021 年到 2025 年人均 GDP 达到 2.1万美元。这意味着中国的峰值排放量预计为 130-160 亿吨二氧化碳，相比之下美国是 55 亿吨，但美国的人口却不到中国的四分之一。
作者点评：排放量是根据人均 GDP而日渐增长，这句话我觉得有道理，如果没钱，我连屁都不敢放一个。
只要眨两下眼睛就可以变焦，这样的隐形眼镜你想拥有吗？
图片源自推特
尽管听起来像只有在科幻小说、电影才会出现的东西，但近日《Advanced Functional Materials》期刊的论文来看，圣地亚哥加大（UCSD）工程团队正在努力让变焦隐形眼镜走入现实。
据了解，这种隐形眼镜创新的功能有两个部分：镜片及控制方式。新型镜片由多层弹性聚合物薄膜制成，施加电流时会更改结构，延展变薄或收缩变厚，这些改变让它的相对变焦效果达到 32%。
图片源自推特
而控制上，研究人员利用人眼产生的眼电讯号控制，透过追踪眼睛做特定动作（上、下、左、右、眨眼、双眨眼）产生的不同电位变化，镜片能根据指令改变焦距。
以目前来说，原型仅在特殊的环境状态进行测试，受试者眼睛周围皮肤还得放置一系列电极侦测，使用上看起来不太舒服，在实际应用以前，这些零件还得大幅缩小尺寸。
图片源自推特
尽管变焦隐形眼镜还得需要数年时间才能发展成熟，但研究人员认为这项创新极具十足潜力，除了仿生眼、可调节眼镜和远程操作机器人应用，在仿生特性上，它还可以成为可视化生理学原理的物理模型，对生物学和医学来说都十足重要。
作者点评：以后每个人都可以和《碟中谍》电影里面的特工一样，带上这个隐形眼镜随便“扫人”了。
本文章部分提及的新闻源来自：YaHoo.hk、Solidot
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English version：
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If only we could turn "carbon dioxide" into fuel.
After the efforts of the past two decades, China has become a major emitter of greenhouse gases around the world. Although China's per capita emissions are only half that of the United States, the huge population, coupled with its fast-growing economy, has made China the largest emitter.
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At present, emissions in most Western countries tend to be stable, but China's emissions are still growing substantially. Under the 2015 Paris climate agreement, China pledged to peak and stabilize emissions by 2030. According to emissions data from 50 Chinese cities, emissions to China will peak by 2025, according to researchers at the Sanming Harvard China Project, published in the journal Nature Sustainability.
These 50 cities account for 35 of the country's emissions, 30 of its population, and 50 of its GDP. The researchers observed evidence of an economic relationship between these supercities called the environmental Kuznets curve, in which emissions stabilize after per capita GDP reaches a certain value.
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According to World Bank forecasts, China expects per capita GDP to reach $ 21 thousand by 2021-2025. This means that China's peak emissions are expected to be 1.3-16 billion tons of carbon dioxide, compared with 5.5 billion tons in the United States, but the population of the United States is less than a quarter of China's.
Author's comment: emissions are growing on the basis of per capita GDP, which I think makes sense, if no money, I even dare not put a fart.
Just blink your eyes twice and you can zoom. Do you want to have contact lenses like this?
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While it sounds like something that only happens in science fiction and movies, according to a recent paper in the journal Advanced Functional Materials, the UCSD engineering team is trying to bring zoom contact lenses into reality.
It is understood that this innovative function of contact lenses has two parts: lenses and control methods. The new lens is made of a multi-layer elastic polymer film. When applied with current, the structure is changed, the extension is thinner or the contraction is thicker. These changes make its relative zoom effect reach 32.
Photo by Twitter
In terms of control, the researchers use the eye electrical signals generated by the human eye to control the lens to change the focal length according to the instructions by tracking the different potential changes generated by the eye doing specific actions (up, down, left, right, blink, double blink).
For the time being, the prototype is only tested in a special environmental state. The skin around the subject's eyes has to be placed with a series of electrodes to detect it, which looks uncomfortable to use. Before practical application, these parts have to be greatly reduced in size.
Photo by Twitter
Although zoom contact lenses will take years to mature, researchers believe that this innovation has great potential. In addition to bionic eyes, adjustable glasses and remotely operated robot applications, it can also become a bionic feature. A physical model of the principles of visual physiology. Is very important to biology and medicine.
Author's comment: In the future, everyone can "sweep people" with this contact lens, just like the agents in the "Mission Impossible" movie.
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