My ex-girlfriend said her motivation for leaving the EU was due to environmental concerns, i.e. that out of the EU we'd have much stricter controls, the UK as a whole would be better off etc. It was quite an interesting justification to read.
I've seen a few justifications like this and I can't work out if the people expressing these opinions are being disingenuous or just extremely naive. It was clear from the people leading the Out campaign what kind of Britain they wanted and it wasn't one where environmental protection is a concern.