Why spending Bio of $$$$ on CO2 storage if we even aren't sure that CO2 is causing AGW? Wasted money that is better spent in Bangladesh if one really wants to save the World.
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Let's assume that some plants are built and the CO2 is captured. For every tonne of anthracite [coal] burned, 3.7 tonnes of CO2 is generated. If this voluminous waste could be pumped back into the ground below the power station it would not matter as much, but the rocks that produce coal are not often useful for storing CO2, which means that the gas much be transported. In the case of Australia's Hunter Valley coal mines, for example, it needs to be conveyed over Australia's Great Dividing Range and hundreds of kilometres to the west. [pipelines cost about $1 million per mile, more when terrain is rough and uneven.]
Once the CO2 arrives at its destination it must be compressed into a liquid so it can be injected into the ground--a step that typically consumes 20 per cent of the energy yielded by burning coal in the first place. Then a kilometre-deep hole must be drilled and the CO2 injected. From that day on, the geological formation must be closely monitored; should the gas ever escape, it has the potential to kill. [...]
The largest recent disaster caused by CO2 occurred in 1986, in Cameroon, central Africa. A volcanic crater-lake known as Nyos belched bubbles of CO2 into the still night air and the gas settled around the lake's shore, where it killed 1800 people and countless thousands of animals.
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From The Weather Makers, Tim Flannery.