The key difference between Harris's evolutionism, and the evolutionism of Childe, White, and Lenski, is that Harris sees technological change occurring because of environmental depletion, whereas the others see technological change resulting from the gradual accumulation of knowledge.

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Harris's cultural materialism emphasizes environmental constraints and resource depletion as primary drivers of technological change and societal evolution, whereas Childe, White, and Lenski focus more on the role of accumulating knowledge and information in driving technological progress and social complexity.

The Key Difference Between Harris's Evolutionism, and the Evolutionism of Childe