The practical ways to reduce your carbon footprint (that actually work)

The topic of buying a new car came up on the weekend but having briefly looked around there's still a lack of hybrid, let alone electric, options to buy. It was easy enough to pick out a petrol mode, but as we already have one hybrid, climate change is something we really be conscious of in our next purchase it would just be nice if manufacturers were as thoughtful or forward thinking as their customers.