As CO₂ Concentrations in the Atmosphere Increase, How Might the Increase

Multiple Choice

As CO₂ concentrations in the atmosphere increase, how might the increase be expected to influence land-based NPP rates?

A) NPP will increase because the CO₂ will replace other nutrients.
B) NPP will decrease because the extra CO₂ will be toxic.
C) NPP will not change because photosynthesis is not limited by CO₂.
D) NPP will increase because CO₂ will inhibit respiration.
E) NPP will decrease because CO₂ will stimulate respiration.