The biosphere is under assault. Climate change is happening faster than species can adapt. Ecosystems are under threat. Tropical forests are falling at the rate of a football field per minute. Amphibians worldwide are going extinct. Passerine birds are declining. The sixth great global extinction is well underway, with an alarming number of species slipping into the extinction vortex. Causing , driving, or exacerbating all these things is a current human population s8ize and growth rate beyond any imaginable global, sustainable carrying capacity. (p. 352-353)Later on the same page they write there is hope but only if human animals align themselves with behaviors to support a sustainable Earth:
The working end of such an alignment would be a rejection of the belief that growth is good, increased consumption is necessary, resources are unlimited, everything natural is stock-and-commodity just there for the taking, and human dominance over nature is a divine right. (p.353)The number of humans is astonishing, for instance there are now about 1.3 billion people in China...the human population of the whole planet in 1900 was only about 1.6 billion. (source)
The population of the state of California is about 38 million. The population of the city of Tokyo metropolitan area is about 36 million. (source, source). Amazing (horribly so).
Just in my lifetime, the number of human animals on the planet has more than tripled.
We are a species of primates out of control (no disrespect to the other primate species).