About 12,000 years ago, when the climate warmed, humans began to come to all parts of North America  During the same period, large mammals, such as mastodons, mammoths, and saber-toothed tiger, became extinct from their once widespread North American lands
So, contrary to the myth that humans once coexisted peacefully with other creatures in nature, human activity caused the extinction of these animals as early as 12,000 years ago
The argument unreflectively excludes humans from nature.