Question

people have identified environmental problems and worked to protect nature ______

○ as early as thousands of years ago
○ only since the 1960s
○ beginning with the colonization of north america

Explanation:

Throughout history, humans have interacted with nature. For example, ancient civilizations had practices to manage resources (like water or forests) and address environmental impacts, showing environmental awareness and protection efforts existed thousands of years ago. The 1960s is too recent, and North American colonization - focused timing is inaccurate as environmental concern/action predates that.

Answer:

A. as early as thousands of years ago