Yes, it is true that early humans had to endure changes in climate and environment, since things like global warming and cooling, along with major events like the Little Ice Age, meant that the temperatures in the world were changing dramatically.
The main reason why we know more about Hammurabi's Code than other early forms of law is because Hammurabi's Code was the first (or at least one of the first) codes of law to be permanently inscribed on stone instead of issued on paper or through word of mouth.
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