First, a disclaimer: this is my first question here, so please point out any deficiency so I can amend it.
Here in Italy, the Government has a recurring policy (it is happening every 2/3 years now) of rejuvenating the traveling cars by issuing so-called "Eco funds": you get between 2000 and 5000 euros to give in your car and buy a new one. Cars with more than 10 years must be scrapped; more recent cars (up to 5 years, IIRC) can be sold as used.
There has been a debate in the local newspapers, highlighting the fact that this practice is not Ecological at all. The rumor is that scraping a 10 year old working car and manufacturing a new one produces more pollution overall than maintaining the old car.
Is there any study that can back-up this rumor? If so, what is the break-even point? I.e. is it possible to find at which "age" running an old car is not "good" anymore, from an environmental point of view?