According to current projections, the human population by 2100 will be about
A) 10 billion.
B) 8 billion.
C) 20 billion.
D) 15 billion.
Question 2
According to the Stockholm Environment Institute, which of the following boundaries on which human survival depends may have already been crossed by humans?
A) Ocean acidification and stratospheric ozone depletion
B) Freshwater use and chemical pollution
C) Climate change, biodiversity loss, and nutrient cycle disruptions
D) Land system change, chemical pollution, and ozone depletion