They want to stay in the EU because they know if they left their life savings would be wiped out and staying the EU allows the young to move to wealthier areas like Britain.I think that the populations of Spain, Portugal and Greece are all quite heavily in favour of remaining in the EU, aren't they? (I could be wrong on that). If you think that a non-EU Tory-led Britain would have given two hoots about British industry, you're more deluded than I'd realised.
As for carbon tax, it's an attempt to deal with the coming cataclysmic climate change - something which will be absolutely impossible to coordinate if the EU fractures.
If you want to stop pollution then you have to look at the problems caused by the developing world. I'm not sure how implementing a carbon tax in Europe helps.