The scheme, being run by the UK's major bus companies, asks drivers to change one out of every 25 journeys from a car to a bus or coach trip.
The campaign is being boosted by a large ticket give-away with the slogan "Join the million fares club"; 100,000 winners will receive ten free single-fare bus tickets to use on bus services from participating operators.
"I wholeheartedly support this campaign, and I also know the sincerity of Greener Journeys' commitment to reducing the environmental impact of car miles, since one of the organisations behind it - First Group - already has a Liftshare scheme," said founder Ali Clabburn.
"However, it is also worth pointing out that - for those who don't have access to a convenient bus service - car-sharing can also have a huge impact on the number of cars on the roads. In fact, if each driver shared just one extra trip every fortnight, the UK would still see over a billion fewer car journeys!"
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