Imagine the fuel savings if every office worker that was able could telecommute instead of burning fuel to get to a job that could be done from home. Imagine the money saved on road maintenance and other things associated with the reduction in traffic. For at least the last 15 years I have commuted back and forth every day to perform a job I could have done without ever leaving my home.
Most office workers would be incapable of working from home all the time - partly from lack of motivation, partly from lack of social interaction. A lot of face to face meetings are pretty important too, and much as they are laughed at, water fountain conversations are where a lot of personal and business relationships are fostered.
The real alternative would be if people lived close to their offices and walked or cycled in every day. It would improve fitness, but also improve communities. In my country lots of people cannot afford to live close to city centers or business parks where they work, so they live in large housing estates on the edge of the city. This leads to estates where essentially everyone is away all day, everyone spends an hour or two in their cars instead of socialising or spending time with families. Then people spend the weekends in their cars again because suddenly all their friends, shops, social and sporting engagements are long distances away from where they live, and so the estates themselves never achieve a sense of community. And, of course, lots of fuel gets burnt.
I'm not sure how this can be rectified - town planning, perhaps, but it also needs a cultural mind-shift away from the car as the preferred mode of transport. It amazes me to see how people will drive 10 miles to the sports center, cycle 20 miles on an exercise bike in an air-conditioned room under strip lights, then drive 10 miles back. WTF?