Is transportation of CO₂ safe?

Yes, in fact carbon dioxide is already regularly transported worldwide. The main options for transportation are by pipeline, ship, truck or rail.  Transport by pipeline is currently the cheapest option and has been in practise for many years both on and offshore. For example in the United States, there are already over 8,000 km of CO2 pipeline actively transporting CO₂ today. 

CO₂ transport systems are monitored electronically and manually with rigorous monitoring standards, so that if there was a drop in CO₂ pressure the transport mechanism would be safely shut down. 

In the UK context, the UK has a wealth of experience, based on designing, constructing and operating 6800km of high-pressure gas pipelines, for which it has earned a global reputation for safety.  The Code of Practice for pipelines to transport CO₂ streams are recognised as being the most cautious in the world, and the design and operation receives detailed scrutiny from the Health and Safety Executive.