Opposition Leader Brendan Nelson has flagged a looming confrontation with the Rudd Government on climate change, saying there is "a high probability" that the Coalition will oppose the Government's blueprint to tackle global warming. As world oil prices hit yet another record, and the Government's climate change adviser Ross Garnaut prepares to release his draft report on Friday, Dr Nelson said introducing an emissions trading scheme would make the introduction of the GST "look like a walk in the park".