Plans to extract shale gas by the process of fracking - blasting water and chemicals into rocks - have sparked protests around the world from campaigners who are concerned about long term damage to the environment.
However, Royal Dutch Shell's chief executive Peter Voser says the process is safe and environmentally friendly when done correctly. He told HARDtalk's Sarah Montague that the extraction of shale gas was less polluting than coal as it generated between 50 and 70% less CO2.
See also: Shale gas to drive US 're-industrialisation'
You can watch the full interview on BBC World News on Monday 3 December at 04:30, 09:30, 15:30 and 21:30 GMT and on the BBC News Channel on Monday 3 December at 04.30 GMT and Tuesday 4 December at 00:30 GMT.
online (UK only) or subscribe to our
Find out who is coming up on the programme by following us on