To Run the espresso calculation, you need:
First to download the pseudo potential C.pw-mt_fhi.UPF and O.pw-mt_fhi.UPF
from the Quantum espresso website, and to copy them into your pseudo directory
of your espresso installation.
then you run,
pw.x <co2.scf.in >co2.scf.out
ph.x <co2.ph.in > co2.ph.out
dynmat.x <co2.dm.in > co2.dm.out
