Answer:
C. Regulate how much carbon dioxide a country can emit
Climate change is usually negative because if it dramatic it could kill most of species.
You can elnimate the moon and mars so the answer is a star
One of the reasons for the success of the smallpox eradication campaign was that small pox only occurred in humans. Smallpox is an extremely contagious and deadly virus for which there is no known cure. it is caused by two variants, Variola major and Variola minor. it is a disease of the past that was eliminated by worldwide vaccination.