Answer:
The correct answer is A. An increase in carbon dioxide in the atmosphere.
Step-by-step explanation:
Fossil fuels, which include, among others, oil, coal and natural gas, are those materials that when burned generate energy, either through the generation of heat that, conducted through the appropriate mechanisms, can generate force or electricity. All these fuels generate greenhouse gas emissions, especially carbon dioxide, for which environmentalists advise a moderate and conscientious use of them, and their gradual replacement by green energy sources.