Not by artificial sources like here in New York, but instead by mother nature herself.

不是像纽约这里的人工照明，而是来自大自然母亲。

The cause is light pollution from artificial sources which is increased by about 10 % each year.

原因是人造的光污染，它每年以大约10%的速度增加。

Researchers originally proposed using artificial sound sources, but that notion got nixed because of concerns about the impacts on marine animals.

研究人员最初提出使用人造声源，但由于担心对海洋动物的影响，这个想法被否决了。

You might have even heard that artificial sources of blue light, like your laptop screen, can mess with your body's internal clock.

你可能听说过人造蓝光光源（例如笔记本电脑屏幕）会扰乱体内的生物钟。

At night, scan the horizon for artificial light sources, such as fires and streetlights, then walk toward the glow of light pollution.

夜间，仔细眺望地平线，寻找诸如火和路灯之类的人造光源， 然后朝光污染造成的光亮走。