Walk.
If you can’t do that or it’s too far, Bike.
If you can’t do that or it’s too far, Bus.
If you can’t do that, Carpool.
If you’re going longer distances, Train.
If you’re going really far, Flying is ok.
You can always purchase carbon offsets for the number of greenhouse gases you consume depending on your mode of travel.
(Don’t mind me dreaming here, but wouldn’t it be nice if the infrastructure in our country matched the mobility priorities of a conscious, fit, and active society?)