It's A Gas, Gas, Gas!

I suppose that my home location makes me susceptible to a charge of nimbyism but I must admit to being none too keen on the proposal to pump oxygen into the coal strata under Loughor estuary to generate coal gas (http://www.bbc.co.uk/news/uk-wales-23699166). Even with carbon scrubbing technologies (and I haven't seen these mentioned), the process (supposedly to be used to generate electricity) would certainly do nothing beneficial for global warming. It also seems appropriate to at least worry about potential subsidence or even the possibility that the currently stable  river deposits that are heavily impregnated with metals from the industrial revolution phase of history could be accidentally liberated. It also seems a shame to even risk a biologically important estuary.