A positive feedback is one in which the products of a process act to increase the rate at which the process operates. Which of the following would constitute a positive feedback in the carbon cycle?
A)Increasing CO2 causing an increase in rates of photosynthesis.
B)Increasing temperature causing an increase in rates of photosynthesis.
C)Increasing temperature causing an increase in rates of respiration.
D)Increasing temperature causing an increase in rates of continental weathering.