Explanation:

Oceans provide the greatest annual amount of CO2 of any natural or anthropogenic source. Other sources of natural CO2 include animal and plant respiration, decomposition of organic matter, forest fires, and emissions from volcanic eruptions.
Industries that are responsible for emission are agriculture processing, cement plants, electricity production, ethanol production, fertilizer production, industrial activity, mining, petroleum/ natural gas and refineries/ chemical.
Recently according to a report it is said that if carbon dioxide (CO2) levels continue to rise as projected, the population of 47 countries across the globe may lose more than 5% of their dietary protein by 2050 due to a decline in the nutritional value of rice, wheat, and other staple crops.