Cement's toll

Cement is made by heating mixes
of rock and argillaceous earth
until it forms klinker which is
ground up into cement’s worth.

But making cement is rather sad
because it makes pollution too
the extra output is pretty bad:
way too much more CO2.

Cement made wet will slowly cure
and form hydration products
reabsorbs CO2 for
making chemistry’s odd ducks.

But greener types of cement
are on the near horizon
money for more research is spent
is money that’s spent wise on.