For starters, whenever I had a hockey game at a given arena, me and my teammates would take tuns driving each other to the game which greatly helped reduce our emissions.
Next, I started carpooling with my friend whenever we would be going at the same time. This was the most challenging out of the locations I frequent as my friend would not always be working out at the same time, which in turn made it harder to carpool with him.
Lastly, for school, I looked at me and my friends schedules for classes to see which friends started at ended at the same time as me during the day. I alternated with different friends and drove in with them depending on the friend that matched my schedule.