The company acts first through its travel policy. The most effective rule is rail by default for journeys under 4 hours, where flying has no door-to-door advantage, then night trains between 4 and 8 hours where services exist, and flying only beyond that or without a reasonable alternative. 2 measures make this rule acceptable: a corporate contract negotiated with SNCF and advance booking of predictable journeys. Bilan Carbone® then measures the modal shift achieved in business travel.
Read the source article: Train or plane: CO2 and actual times for 6 journeys from Paris