AAP: KEVIN Rudd has defended the emissions trading scheme amid suggestions it does not encourage major polluters to change their ways. Mr Rudd was on radio this morning spruiking the Government’s response to climate change, which the opposition has described as a virtual carbon copy of its own policy. “The whole point of the system is to reduce emissions,” Mr Rudd told ABC Radio. “Nothing’s going to be perfect but it certainly beats sticking your head in the sand, …