In message , Steve Firth
writes
The Natural Philosopher wrote:

Very little industrial process actually generates Co2..smelting does a
bit, as does concrete making.


Concrete making is carbon negative. Taking a large view cement making is
close to being carbon neutral, if one ignores the fuel consumption which
you seemed to be suggesting is a necessary part of your calculation.


I don't know about carbon negative or even neutral but it's a nice way
to lock up carbon dioxide. Concrete actually works by soaking up CO2 as
it cures because it turns to limestone eventually IIRC. ISTR some
research about soaking concrete with liquid CO2 to cure it faster and
allow the manufacture of some extremely un-concrete like structures
(springs being one that come to mind, if I can find the reference I'll
post it.)
--
Clint Sharp