Due to the tube strike I learned a lot about London bus, tube and train ticket systems (e.g. like the above oyster card, a 10 pounds recharge card). I am happy that my sister has an insight into the matter because the system is fairly complicated (e.g. for taking a longer trip a day ticket is better). However it is not as crazy as the subway system in Tokyo, where on a longer trip it may happen that one needs to pass several toll points and buy new tickets each time. As I understood this is mainly due to the fact that the lines have seperate owners. The Tokyo subway ticketing system reminded me a bit of the toll policy in Germany in medieval times, where virtually every feudal sovereign put up a toll station (it reminded me actually also of the german current network). And likewise the ticket problem in my last post seems to be at least partially due to national borders.
Despite of new means of communication such as cell phones, videoconferencing etc. you will still have to meet with your potential collaborators/business partners etc. in person. This implies that traffic will increase with growing globalization. So if one wants to reduce carbon output in traffic one of the first things one should think about is how to improve the train system as an alternative to planes. A better website may be a start.