Answer:
d. all of the above
Step-by-step explanation:
All of the given choices contribute to the elevated level of carbon in the atmosphere.
This is one of the leading cause of climate change.
- Greenhouse emissions from the surface is a huge problem which originates from increasing the release of these gases into the atmosphere.
- Carbon dioxide is one of the greenhouse gases, and it is the main component of the emissions.
- Deforestation involves the removal of trees from the earth surface.
- Trees naturally removes carbon from the environment. They use the carbon to manufacture their own food.
- Human activities such as industrial processes, burning of firewood for cooking, etc. all contributes significant amount of carbon into the atmosphere.