[nisten]

Well, if they can afford to pay market-rate insurance on the liability of their sequestration method then yeah sure.

[Gravityloss]

Interesting thought. I know nuclear plants are required by law to set aside a part of revenue for eventual long term storage of the waste. You could have that for coal plants.

Of course we already have quotas and trade which is designed for something similar.

And the offsets have their problems...