Final answer:
Early human activities shaped the environment significantly, from transforming grasslands to deserts to modifying landscapes through controlled burns and agricultural practices.
Explanation:
Our ancestors had significant impacts on the planet Earth through various activities that influenced the environment. For example, early humans' grazing practices led to transformations of grasslands into deserts, while Native Americans modified landscapes through controlled burns and agricultural practices. The development of the modern industrial era further escalated human impact on the environment.
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