I also seriously question the concept of massive investment in CO2 dumping/sequestration alone, as it seems more likely that CO2 will be used as a feedstock to

I also seriously question the concept of massive investment in CO2 dumping/sequestration alone, as it seems more likely that CO2 will be used as a feedstock to generate more complex and useful molecules. That said, the endpoints of the pipelines could just route to processing plants instead of underground carbon sinks, so the pipeline part could be valid, if appropriately structured.