Artificial illumination on a Kuiper Belt Object would stand out because it would vary less than reflected sunlight does when the world moved toward or away from the sun.

柯伊伯带天体上的人工照明之所以会显得特别突出是因为不管它转向或者转离太阳，其所反射的太阳光都不会变化很大。

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Even if you spotted something suggesting a city in space, you'd still have to figure out whether the light was artificial - alien-made, in other words - or simply reflected back from the sun.

即使你在宇宙空间里发现了些什么，你还是需要分辨这些光是否人造——外星人造的，还是说，它仅仅是反射的阳光。

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Others include shrouding Earth in sun-reflecting aerosol particles, manufacturing CO2-absorbing artificial trees, and pumping CO2 into underground reservoirs.

还有其它的计策，比如用具有反光效应的气溶胶粒子覆盖地球，或生产吸收二氧化碳的人工树木，还有把二氧化碳倒入地下水库的计策。

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Cancer Research UK says people should not use artificial tanning devices for cosmetic purposes because they - like the sun - increase skin cancer risk.

BBC: NEWS | Health | Europe issues warning on sunbeds

Elsewhere in the gardens, 18 "supertrees, " artificial treelike structures between nine and 16 stories high, will offer shelter from the blazing Singapore sun.

WSJ: Singapore to Open Gardens by the Bay

All organic crop rotations contain three to four years of no ploughing because grass leys use the sun's energy to fix nitrogen for subsequent crops in place of oil-based artificial fertiliser.

ECONOMIST: Organic matter