Answer: Burning of fossil fuels and deforestation.
Step-by-step explanation:
Burning of fossil fuels: Burning of fossil fuels greatly influences the amount of carbon dioxide present in the environment. It releases carbon dioxide, carbon monoxide, sulfur dioxide et cetera.
This increases the amount of carbon dioxide levels. This carbon dioxide in atmosphere diffuses into oceans and leads to acidification of ocean.
Deforestation:The amount of carbon dioxide is regulated by trees as they intake carbon dioxide for the process of photosynthesis. But because of deforestation there are less trees to compensate the amount of carbon dioxide in the environment.