Final answer:
The process most likely to release carbon dioxide into the environment is burning wood in a campfire, as it directly converts carbon in wood into CO2 through the process of combustion.
Step-by-step explanation:
The process that would be most likely to release carbon dioxide into the environment is burning wood in a campfire. This is because burning wood is a combustion process that converts the carbon stored in wood into carbon dioxide (CO2), a greenhouse gas, which is then released into the atmosphere.
Other options such as building a wooden house or chipping up wood for mulch do not involve burning; therefore, they do not release significant amounts of CO2 directly into the atmosphere. Growing trees in the yard actually helps to remove CO2 from the atmosphere through the process of photosynthesis.