Why is the anthropogenic factor often considered a threat to nature?

For his life, man creates an environment that is unsuitable and unnatural for most existing organisms – plants, animals. Ecosystems, forests, habitats of many animals are massively destroyed. Only some of them manage to adapt. The products of human activity are many toxic substances that destroy plant and animal organisms, microorganisms. And the products of human life are becoming more and more, they cover the entire planet. This causes disruption to natural communities and existing ecosystems. Due to the global influence of man on nature, the anthropogenic factor is considered to be threatening for it.