It looks like, from the headlines this morning, that things are going to get worse before they get better. I predict a lot more people wil be trying to reduce their vehicle use if possible. I agree that using taxis and buses is sometimes better for some, but let's face it, most of us who have cars do not use then 24/7. They have to sit on our drive for when we need them. A good compromise (as I'm sure many do already) is to re-think how many trips you actually need to make in the car. I use my car a lot less in the summer when I walk to collect my son, and sometimes walk to the corner shop. I just look at all my other journeys I need to make, going to my partners house after work, coming back in the morning, visiting my parents 30 miles away (with my son); would cost a lot more in public transport than it currently does in fuel. Add to that cost of a taxi for garden/DIY stuff and there is no comparison (taxis are also abysmal here, I've never had one on time).
The main factor is TIME! I don't have time to make greener transport choices if I want to keep my job