I think in theory global warming is tough bite to libertarianism, as simple analysis of game theory tells there almost zero incentive to reduce your 'polluting' in fear of law-suits. As long as you are marginally small 'polluter' compared to the whole amount of carbon accumulation your responsibility is insignificant. If you happen to be a big polluter, the most damage has already been done so on the margin polluting more is irrelevant. As all will think the same, the 'solution' of the game is inaction, which in this case could be 'game over'. As discussed already, there are many juridical problems to solve that are difficult for single legitimate court, not to mention the wild west court model of the libertarianism.

In practice this is very boring debate as I have ceased believing in AGW long time ago. It is not an issue of this thread but it would be interesting to debate science behind AGW too.