The major heat waves in the past had devastating effects on the agriculture.
Explanation:
The agriculture in the past was much more primitive. It was mainly dependent on the natural factors, as the humans still hadn't invented sophisticated methods to maintain and protect the plants. When a major heat wave occurred for example, the plants suffered badly, often resulting in their drying out and destruction of the crops they produce.
While in modern times the humans have developed sophisticated irrigation methods, with the water being brought to the farmlands from hundreds of kilometers away, the people in the past were not able to do that. The people were relying only on the local water bodies for irrigation, and when there was a major heat wave those water bodies had significantly less water, or were drying out. Since the people didn't had any solution, their crops were failing and they didn't had enough food to survive, resulting in collapses of whole societies.
Examples where major heat waves destroyed civilizations are:
Learn more about the Maya Civilization https://brainly.com/question/856999
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