Business travel is under environmental scrutiny, and top executives are reassessing how or whether they will travel to do business.

John Sauven, executive director of environmental campaigners Greenpeace, says: “Companies like Sky and Marks & Spencer are beginning to deal with the low-hanging fruit of using low emission vehicles, video conferencing and using trains where possible. But in terms of where we need to get to in cutting CO2 emissions in the next 100 months, far more radical measures need to be taken.