Transportation fuels are considered a major source of CO2 pollution. The ocean absorbs most of CO2 and trees absorb a lot, although trees are being cut faster than new ones can grow.
Jets use low grade kerosene. Maybe someday, jet engines might convert to LNG, which is slightly better. Trucks and cars might someday tend toward electric or fuel cells, but not very soon.
I contribute my small part to global warming by running spark ignition model engines!!