Shipping is a problem but then building new factorys with new machines etc closer to home would be just as damaging to resources. And it would cause problems to those countrys that rely on exporting goods to make money. Driving to a comp isn't so bad really, you want to go you go. If however you also drive down to the local shop when you could just as easily walk or drive to work when the train would do then thats a problem. To be honest i think trials riding isn't a great evil in the world of engery saving and the enviroment. Try talking to people about things that would make a bigger difference, turning off unused lights, and not leaving the tv on stand by, unp[lugging phone chargers when they aren't being used, those would probably do a lot more for the enviroment then people stopping driving to the infrequent comps!