Could this help Global Warming?

With regards to global warming, it's a real struggle to capture co2, there are a few theories out there to capture it, one example of carbon capture was where they took the emissions from a coal fired powerstation, compressed it into a liquid then pumped it into old empty oil wells under the sea floor, it was quite expensive though and as there aren't many legislations restrictions on emitting co2 (as it's what we breathe out anyway) it made more sense just to release it the emission controls are more based around nitrogen oxide (nox), sulphur dioxide (sox) and carbon monoxide.