While driving your car on the daily commute may be the most convenient option for you, it comes with a heavy personal financial cost and environmental cost, especially if everyone is doing it.Not only is driving one of the biggest contributors to air pollution and greenhouse gas emissions, it also eats up your bank account, particularly as fuel costs continue to climb.The alternatives to driving are obvious, but you might be surprised at some of the options in the more sustainable modes of transportation as government is more supportive of alternative transport, technology is improving and costs are falling. Here are a few sustainable modes of transportation to throw into your transportation mix: BikeMany Australian cities have invested heavily in bike lanes that give bikers easy access all around many urban and some suburban areas. Biking is 100% green and it’s also a great way to layer in your daily workout. Biking is also becoming a lot safer as bike laws are changing to give more leeway to riders.Share a BikeAround cities like Brisbane and Melbourne, services like Citycycle allow you to rent a bicycle to an hour, a week or a year. Carpool You can slash you gas bill considerably by finding other people on your daily work commute. You can ask around the office to see who lives in your area, consider downloading a phone app that allows you to connect with other people in your neighborhood. Or register with one of the organised car pool businesses.Ditch the Car and Rent Ad HocCar Hire companies offer fantastic weekend rental rates - specifically targeting urban dwellers who con't own and only rent cars when they need them. Pick up on Friday night and drop off on Sunday. And you can often get great frequent renter deals.Public Transport Taking the ferry, train and or bus to work can be an easy, cheap and stress-free way to enjoy your daily commute. Telecommute Many companies are supporting sustainable transportation by letting employees work remotely and telecommute. If you think you'll be more productive working from home, ask your boss - even if it's only for part of the time. Walk If you’re close enough and have the time, ditch the car and walk it. If you aren't close enough, walk part of the way and catch public transport or meet a car pool for the rest. Walking is great exercise and is green as can be.There are literally thousands of sustainable commute options.We have launched with just a few, but to eventually capture them all and give broad based access to all kinds of eco commuting options. Image: Shutterstock