https://phys.org/news/2018-07-extinction-natural.html

First of all, there are strong practical arguments against biodiversity loss. Variation, from individual genes to species, gives ecosystems resilience in the face of change. Ecosystems, in turn, hold the planet steady and provide services essential to human welfare. Forests and wetlands prevent pollutants entering our water supplies, mangroves provide coastal defence by reducing storm surges, and green spaces in urban areas lower city-dwellers' rates of mental illness. A continued loss of biodiversity will disrupt these services even further.

Seen in this light, the environmental damage caused by resource extraction and the vast changes that humans have wrought on the landscape seem extremely high risk. The world has never before experienced these disturbances all at the same time, and it is quite a gamble to assume that we can so damage our planet while at the same time maintaining the seven billion humans that live on it.