Mother Nature: As we grapple with climate change, it's important to remember that this isn't the first time climate change has threatened grand, seemingly unstoppable civilizations.
The Ancestral Puebloans, also known as the "Anasazi" by the Navajo, are one of the most famous examples of an ancient civilization that collapsed due to climate change. Once dominant across the Colorado Plateau in places like Chaco Canyon and Mesa Verde (pictured), the Ancestral Puebloans abandoned their distinctive homes sometime...