The primary problem is the greenhouse effect. Greenhouse effect is when some gases (including CO2) absorbs some portion of sun's heat to make the atmosphere warm to support life. But when the amount of CO2 etc. increases in the atmosphere, it heats up more than it is required. So, by limiting CO2 emission, we can solve this problem.
Answer: c. self- fullfilling prophecy
Explanation: i am not sure if im right but i think that its c because self fullfilling prophecy is when someone predicts something about his or herself because of feelings, actions,/beleif