Question: Which of the following represents an alarming positive feedback loop of global warming ?

Options:

A) increasing temperature raise humidity, which further increases temperatures.

B) decreased pH of the ocean increases the rate at which carbon dioxide is absorbed by the oceans from the atmosphere.

C) increased use of fossil fuels adds sulfate aerosols into the atmosphere, which traps more heat.

D) increased levels of atmospheric carbon dioxide increases photosynthesis, which further increases carbon dioxide atmospheric levels.