ScienceDaily: The potential for reducing carbon dioxide emissions from cars is not being fully realized. The average Swedish car buyer still purchases a heavier and thirstier car than the average European, even though the difference has decreased in recent years. Over the last thirty years cars sold in Sweden have become larger, and what’s more they accelerate ever faster. This has entailed that some of the cars’ technical improvements have not led to lower fuel use. If cars had not become …