"Jose" wrote in message
That's part of the rationale for carbon credits.... Someone flies a
relatively clean jet (or fires up a relatively clean refinery), and pays
money to those who have relatively dirty ones.
They the money and use it to clean the dirty ones up.

The idea is that it's less expensive to improve the dirty ones than to get
the same reduction in the ones that are already clean.


I thought the concept was opposite to that: If you upgrade or build to
better than the declared standard, the amount you under-polute gives you
credits which you can sell to the over-poluters. The over-poluters use those
bought credits to help reduce the monitary penalty they pay for poluting
over the standard. Thus the carrot and the stick, rather than just the
stick.