At the time we bought it, it seemed to make sense. We weren't as aware of the damage to the environment caused by thirsty cars. And we needed a big car to fit three baby seats when the kids were all small. A saloon car just wouldn't do it.
But now the kids just need booster seats rather than baby seats, so they can fit in a much smaller car. And we have realised we can always hire a big car on the one or two occasions a year we really need it, such as going on holiday. It's time to trade down to a smaller car.
How environmentally friendly is your car? You can type its details into http://www.whatgreencar.com/ and get a rough-and-ready eco-rating. Ours scored 68% overall rating (confusingly, high numbers are worse, so that's quite a poor score), with 89% climate change score (a dire score) and 37% air quality (not a bad score). We're hoping to improve on that considerably with our next purchase, and save ourselves money on fuel, road tax and running costs as well.