The main form of radiation released by Earth at night is infrared radiation.
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Infrared radiation is invisible to the human eyes, but we can feel it as heat.
The first map shows colonized nations in 1945. European powers had colonized vulnerable and faltering nations to undergird their economies. The second map shows that, even more than 50 years later, the majority of moderately developed or underdeveloped nations were former colonies of the presently highly developed nations. This conclusion supports neocolonialism in that former colonies have moved toward industrialization and economic independence. The economies of the former colonies are still, to an extent, dictated by, and even hampered by, their former colonizers.
Answer: Metal Detectors
Explanation: Metal detectors are inexpensive and easy to use equipment used to discover relics of the past. While it is useful in archaeology as a tool that discovers objects from the past quite easily, it is also a threat to archaeology. Some hobbyists and looters who come across archaeological finds which may be important to understanding past civilizations or a different era do not report these finds. Even worse, some looters knowingly infringe on archaeological sites and are aided by the metal detectors.
I don’t know if anyone will know the answer to this one