Final answer:
Deforestation makes it harder for Earth to process carbon dioxide from fossil fuels.
Step-by-step explanation:
The human activity that makes it harder for Earth to process the carbon dioxide produced in fossil fuels is deforestation.
Deforestation refers to the clearing of forests for various purposes such as agriculture, logging, and urbanization. When forests are cut down, the trees can no longer absorb carbon dioxide through the process of photosynthesis. This leads to an increase in atmospheric carbon dioxide levels, contributing to climate change.
Learn more about Deforestation and carbon dioxide processing