According to Wikipedia 1mile in a plane is equivalent to 1 mile in a 4 seat car per person. So your personal emissions from say round trip SF to NYC is the same as driving a car for 8200 miles. And that doesn't include the other enviromental impacts. In other words travel is arguably a very environment unfriendly thing you to do

https://en.m.wikipedia.org/wiki/Environmental_impact_of_avia...