Question

people have identified environmental problems and worked to protect nature ______.

beginning with the colonization of north america

as early as thousands of years ago

only since the 1960s

Explanation:

To determine the correct answer, we analyze each option:

• "Beginning with the colonization of North America" is incorrect because environmental awareness and protection efforts predate North American colonization.
• "As early as thousands of years ago" is correct. Human societies have recognized environmental issues and taken steps to protect nature for millennia (e.g., indigenous practices for resource management).
• "Only since the 1960s" is incorrect as formal environmental movements in the 1960s were not the start of all environmental protection efforts.

Answer:

B. as early as thousands of years ago