As is most trade globally.
Time to stop picking on aviation as some sort of bogie man - what about the world's shipping fleets?.....burning disgusting HFO in their engines, chuck all their waste into the oceans, swill out their tanks while no-one is looking. What about the snowflake generation who complain about the climate but are the first ones to think it's ok to walk around buildings in t-shirts in the winter and demand the heating is turned up because they're cold. You'll find many of these are the same hypocrites bleating about planes.
The prognosis my friends is simple: too many people - humans consume; not enough trees - trees can save us. Stop blaming planes.