itchGreen enables individuals and groups to create itineraries and specify their own departure time and price. For example, a traveler might create one of the following itineraries: A shuttle van from DEN to Breckenridge for a weekend of skiing; a bus for their classmates to get from VT to NYC for Thanksgiving; or a charter bus for a school trip to Washington DC. Once created, itineraries and specified prices can be viewed and joined by other travelers. All itineraries are made available to professional transportation carriers in real time. After viewing an itinerary, a carrier can bid to service the passenger's itinerary at the traveler's specified price. Embedded in this price is the cost of a carbon offset to neutralize the environmental impact of the traveler's trip.