Pick up what? Your trash? Or someone else's tubes and CO2 cartridges? Nice that you are doing something but are you also picking up the discarded bottles, cans, fast food wrappers, car tires and used condoms? I don't know if I have ever seen a used C/02 cartridge. I have seen a tube or two over many years of riding. But I have seen plenty of other garbage everyday, discarded by people in cars and trucks.

If you meant your tubes and cartridges then sorry but you are not earning kharma points for that. You are simply doing what you ar esupposed to do.