Which of the following has the greatest impact on global warming?

a. Population growth,

b. Agriculture expansion

c. Forest depletion,

d. Dependence of fossil fuels

Forest depletion has the greatest impact on global warming. The answer is letter C. the trees in the first provides shelter, food and oxygen in the surrounding. One of the causes of global warming is CO2 and CO2 is used by plants for cellular respiration. If these are destroyed, the things it gives will be gone and therefore will increase global warming.