I thought it was more environmentally friendly to keep using the old
stuff ...

That's a very important point and rarely given proper consideration. It
uses CO2 to make a new appliance and ship it half way round the world.

The problem is, it's almost impossible to get reliable figures. The
estimates for how much CO2 is produced to make a car vary over a ratio of
ten to one.

But it may very well be the case that continuing to drive an old Jag at
22mpg is actually greener than buying a brand new Prius.

SteveT